A spandrel is a space found between two arches or between an arch and the frame around it. In architecture, this area often adds beauty and helps complete a building’s design. You can see spandrels in bridges, churches, windows, and old buildings.
The word also has a special meaning in biology, where it describes a feature that develops as a side effect of another trait. Understanding the spandrel definition helps you learn how buildings are designed and how some natural features evolve.
This guide explains its meaning, types, uses, history, and examples in simple words for everyday readers.
1. What Is a Spandrel? Simple Definition
The spandrel definition refers to the space between the curve of an arch and the straight lines or shapes around it. It is a common term in architecture, especially when describing arches, bridges, and building walls.
Imagine a rounded arch inside a square frame. The arch curves upward, but the frame has straight sides. The spaces left between the curve and the frame are called spandrels.
These spaces can be plain or decorated. Some contain stone carvings, colorful tiles, or other designs.
In modern buildings, the word can also describe the area between the top of one window and the bottom of another window on the floor above.
Simple Example
Think about a stone bridge with several arches. Look at the area above each curved opening and below the top of the bridge. That area is part of the bridge’s spandrel.
In simple words: A spandrel is a space or building area formed around an arch or between parts of a building.
The exact meaning depends on the type of structure being described.
2. Spandrel Meaning in Architecture
In architecture, a spandrel is an area created by the shape and placement of other building parts.
Architects often use this term when discussing arches, doorways, windows, and bridges.
A traditional arch has a curved upper edge. When that curve meets a straight frame or wall, it leaves spaces on either side. These are known as spandrels.
They may appear small, but they can play an important role in the look of a building.
Main Features of Architectural Spandrels
- Location: Usually beside or above a curved arch.
- Shape: Often triangular or curved.
- Material: May include stone, brick, glass, or metal.
- Design: Can be plain, painted, or carved.
- Purpose: May fill space, support a design, or cover parts of a structure.
For example, an old church may have beautiful carvings inside its arch spandrels.
A modern office tower may use glass panels to hide the floor structure between two rows of windows.
Both are examples of spandrels, but their appearance and construction are different.
3. Different Types of Spandrels
Spandrels come in several forms. Their design depends on the building, materials, and construction method.
Some are part of traditional stone structures. Others are found in modern glass buildings.
Here is a simple comparison.
| Type of Spandrel | Meaning | Common Example |
|---|---|---|
| Arch Spandrel | Space beside the curve of an arch | Church doorway |
| Bridge Spandrel | Area above an arch and below the bridge deck | Stone arch bridge |
| Window Spandrel | Wall area between windows on different floors | Office building |
| Glass Spandrel | Opaque or covered glass panel that hides building parts | Glass tower |
| Decorative Spandrel | Spandrel with artwork or patterns | Historic building |
| Structural Spandrel | Building element that helps carry or transfer loads | Spandrel beam |
Arch Spandrels
These are common in traditional architecture. They fill the areas between arches and their surrounding frames.
Bridge Spandrels
In an arch bridge, the spandrel is the area between the arch and the bridge deck. It may contain solid material or have open spaces.
Window Spandrels
These are found between windows on different floors. They may cover the edges of floors, beams, and other building parts.
Decorative Spandrels
These feature patterns, symbols, carvings, or painted artwork.
Each type serves a different purpose, but all are connected to the arrangement of architectural spaces.
4. History and Origin of the Word Spandrel
The word spandrel has been used in architecture for centuries.
Its history is linked to the development of arches in buildings and bridges.
Ancient builders used arches because they could carry weight and create large openings. Arches became important in Roman construction and later in many other architectural traditions.
As builders placed arches inside walls and frames, spaces appeared around the curves.
These areas became useful places for decoration and construction.
Spandrels in Ancient Buildings
Roman builders used arches in bridges, aqueducts, and public buildings.
The spaces around those arches were often filled with stone or brick.
Later, medieval builders used spandrels in churches, castles, and large halls.
Gothic buildings sometimes featured carved figures, leaves, and religious symbols in these areas.
During the Renaissance, architects continued to use decorated spandrels in grand buildings.
The English word has a history connected with older architectural vocabulary, although its exact linguistic origin is uncertain.
Today, the term is still used by architects, engineers, historians, and designers.
5. What Is the Purpose of a Spandrel?
The purpose of a spandrel depends on where it is used.
In some buildings, it helps fill an empty area. In others, it provides a surface for decoration or covers important structural parts.
A spandrel may also be part of a system that supports loads.
Filling Empty Spaces
Arches create curved openings, while walls and frames often have straight edges.
Spandrels fill the spaces left between these different shapes.
This helps create a complete architectural design.
Improving Building Appearance
Architects can use spandrels to add beauty and detail.
A plain wall may look more interesting when its spandrels include carvings or patterns.
Covering Building Components
Modern buildings often have spandrel panels between floors.
These panels can hide concrete slabs, beams, insulation, and other parts that are not meant to be visible.
Supporting Construction
Some spandrel walls and beams help carry loads.
However, not every spandrel is structural. Some are mainly decorative or used as coverings.
Creating Visual Balance
Spandrels can help connect arches, windows, and walls into one clear design.
This makes the building look more organized and complete.
6. Spandrel Definition in Modern Buildings
In modern architecture, the meaning of spandrel often relates to the area between windows on different floors.
Many office buildings have large glass walls called curtain walls.
These walls include clear glass for windows and opaque panels in other areas.
The opaque panels are often called spandrel glass.
What Is Spandrel Glass?
Spandrel glass is glass used to cover areas where people do not need a clear view.
It is commonly placed in front of floor slabs, columns, insulation, or mechanical systems.
Unlike ordinary clear window glass, spandrel glass is designed to block or hide the view behind it.
It may have a coating, ceramic frit, or another treatment that makes it opaque.
Example in an Office Building
Imagine a ten-story office tower.
Each floor has large windows. Between the top of one row of windows and the bottom of the next row, there is a band of darker glass.
That band may be spandrel glass.
It helps the outside of the building look smooth while hiding the floor structure behind it.
Spandrel systems must also be designed with care for heat, moisture, and fire safety.
This makes them an important part of modern building design.
7. Spandrel Meaning in Biology and Evolution
The word spandrel also has a meaning in evolutionary biology.
In this field, a spandrel is a characteristic that develops as a byproduct of another feature rather than because natural selection directly favored that characteristic.
This idea became widely known through the work of biologists Stephen Jay Gould and Richard Lewontin in 1979.
They used architectural spandrels as a comparison to explain how some biological traits may arise.
Simple Biological Explanation
Imagine that an animal develops a body structure because it helps with movement.
That structure may also create another feature.
The second feature might not have developed because it was useful. It may simply be a result of the first structure.
In evolutionary discussions, such a secondary feature can be described as a spandrel.
Spandrel vs. Adaptation
An adaptation is a trait shaped by natural selection because it helped organisms survive or reproduce.
A spandrel, in the evolutionary sense, arises as a byproduct of other evolutionary changes.
| Feature | Adaptation | Spandrel |
|---|---|---|
| Basic meaning | Trait shaped by natural selection | Byproduct of another feature |
| Original cause | Selection for a useful effect | Other developmental or structural changes |
| Must be useful? | Was favored for its effect | Not necessarily |
| Can gain a function later? | Yes | Yes |
| Main question | What benefit shaped the trait? | What other changes produced it? |
An important point is that a spandrel can later become useful.
A feature that begins as a byproduct may eventually gain a new function and become subject to natural selection.
Scientists study these possibilities when explaining how complex traits evolve.
8. Famous Examples of Spandrels
Spandrels appear in many well-known buildings and architectural styles.
They are often easy to miss because people focus on arches, windows, or decorations instead.
St. Mark’s Basilica in Venice
Architectural example
The St. Mark’s Basilica is often discussed in explanations of spandrels.
Its domes, arches, and decorated surfaces show how spaces created by architectural forms can become places for artwork.
Gould and Lewontin famously used the building’s decorated pendentives as an analogy in their discussion of evolution.
A pendentive is not exactly the same as an ordinary arch spandrel. It is a curved triangular surface that helps support a dome above a square space.
The comparison is useful because both show how one architectural design can create spaces that later receive decoration.
Stone Arch Bridges
Traditional stone bridges often have spandrel walls above their arches.
These walls help contain the material between the arch and the bridge deck.
Some bridges have open spandrels instead of solid ones.
Gothic Churches
Gothic churches frequently use pointed arches.
The areas around these arches may include detailed carvings, patterns, and religious artwork.
Modern Glass Towers
Many commercial buildings use spandrel panels to hide floors and mechanical parts.
These panels help create a clean and consistent exterior.
All these examples show how the term applies to different structures and time periods.
9. Difference Between Spandrel, Arch, and Pendentive
People sometimes confuse spandrels with other architectural features.
The terms are related, but they describe different parts of a building.
Spandrel vs. Arch
An arch is a curved structural or decorative element that spans an opening.
A spandrel is an area around an arch or between architectural elements.
For example, the curved stone structure above a doorway is the arch. The space between its outer curve and the surrounding frame may be the spandrel.
Spandrel vs. Pendentive
A pendentive is a curved triangular element that helps a circular dome rest above a square space.
A spandrel is a broader term for certain spaces around arches or between building parts.
Pendentives and spandrels can look similar, but their structural roles are not always the same.
Spandrel vs. Tympanum
A tympanum is the area enclosed by an arch and the horizontal lintel or base below it, often above a doorway.
A spandrel usually lies outside the arch curve, within the surrounding architectural layout.
Quick Comparison
| Term | Simple Meaning | Main Location |
|---|---|---|
| Arch | Curved element over an opening | Doorway, bridge, window |
| Spandrel | Space around an arch or between building elements | Beside arches or between floors |
| Pendentive | Curved triangular dome support | Beneath a dome |
| Tympanum | Enclosed area within an arch above a lintel | Above a doorway |
Knowing these differences helps when reading about architecture or studying historic buildings.
10. How to Use Spandrel in a Sentence
The word spandrel is mostly used in architecture, engineering, art history, and biology.
It is not common in everyday conversation, but it is useful when describing buildings or evolutionary ideas.
Here are some natural examples.
Architecture Examples
Example 1: The architect decorated the spandrel with a beautiful stone pattern.
Example 2: The old bridge had strong spandrel walls above its arches.
Example 3: Workers repaired the damaged spandrel near the church entrance.
Example 4: The building used dark spandrel glass between its floors.
Example 5: The museum’s arch spandrels contained detailed carvings.
Biology Examples
Example 6: The scientist explained that the trait might be an evolutionary spandrel.
Example 7: Not every biological feature is an adaptation; some may be spandrels.
Common Mistakes to Avoid
One common mistake is calling the arch itself a spandrel. The arch and the spandrel are different features.
Another mistake is assuming every spandrel supports weight. Some spandrels are decorative, while others are part of structural systems.
In biology, it is also incorrect to assume that a spandrel can never become useful.
Helpful tip: When you see the word in a sentence, check whether the topic is architecture or evolution. The context will usually make the meaning clear.
FAQs
1. What is the simple definition of spandrel?
A spandrel is the space between an arch and the surrounding frame or wall. In modern buildings, it can also mean the area between windows on different floors. The word is mainly used in architecture, but it also describes evolutionary byproducts in biology.
2. What is a spandrel in a building?
A spandrel is an architectural area found around arches or between floors. It may be made of brick, stone, concrete, metal, or glass. Depending on the design, it can fill space, cover structural parts, provide decoration, or form part of a load-bearing system.
3. What is the difference between an arch and a spandrel?
An arch is a curved element that spans an opening. A spandrel is the space around that arch, usually between its outer curve and a nearby frame or boundary. The arch forms the curve, while the spandrel occupies an area beside or above it.
4. What is spandrel glass used for?
Spandrel glass is used to hide building parts behind a glass exterior. It commonly covers floor slabs, beams, insulation, and mechanical systems. It also helps architects create a consistent appearance across a building’s outside walls. Spandrel glass is usually opaque rather than transparent.
5. What is a spandrel in evolutionary biology?
In evolutionary biology, a spandrel is a trait or feature that arises as a byproduct of other changes rather than through direct selection for its own function. The idea helps scientists consider explanations for traits beyond adaptation. A spandrel may later gain a useful role.
6. Are spandrels structural or decorative?
Spandrels can be structural, decorative, or both. Some spandrel walls and beams help carry loads. Others provide space for artwork or cover building components. Their function depends on the materials, design, and type of structure in which they are used.
7. Where can you find spandrels in real life?
You can find spandrels in stone bridges, churches, historic doorways, office towers, and other buildings. Look beside curved arches or between rows of windows on different floors. Some spandrels are easy to see because they contain carvings, colored glass, or decorative patterns.
Conclusion
The spandrel definition describes a space formed around an arch or between certain parts of a building. Spandrels appear in bridges, churches, windows, and modern glass structures. They may serve decorative, practical, or structural purposes.
In biology, the term has a different meaning. It refers to a feature that develops as a byproduct of another evolutionary change.
Understanding both meanings makes it easier to recognize spandrels in architecture and follow discussions about evolution.
Alexander Frost is a passionate writer dedicated to exploring meaningful names and helping readers discover identities that inspire.
