radial symmetry
Definition
Noun: A type of symmetry where the parts of an organism or object are arranged regularly around a central axis, so that any plane passing through the central axis divides the structure into mirror-image halves. This is contrasted with bilateral symmetry, where only one plane creates symmetry.
Usage
The term is used primarily in biology and geometry to describe the structural arrangement of living organisms or shapes. It indicates that multiple identical sections radiate from a central point.
Examples
- The sea anemone exhibits radial symmetry, allowing it to interact with its environment from all directions equally.
- In geometry, a circle possesses radial symmetry.
- Biologists classify jellyfish as having radial symmetry.
Advanced Usage
- Developmental Biology: The concept is used to describe body plans (radiate animals) and is a fundamental organizational principle in embryology for certain phyla.
- Botany: Used to describe flowers where petals, sepals, and stamens are arranged symmetrically around the center (e.g., a lily flower has radial symmetry).
- Art and Design: The principle is applied in patterns, mandalas, and architectural elements where components are arranged around a central hub.
Variants and Related Words
- Radially Symmetrical (Adjective): Describing something that has radial symmetry.
- A sand dollar is a radially symmetrical organism.
- Radial (Adjective): Relating to, arranged like, or moving along a radius or rays from a center.
- The tire had a radial pattern.
- Bilateral Symmetry (Noun): The contrasting type of symmetry where an organism can be divided into two mirror-image halves along only one plane.
Synonyms
- Actinomorphy (specifically in botany for flowers)
- Radial Balance
- Rotational Symmetry (in geometry, though not perfectly identical in all contexts)
Antonyms
- Asymmetry: Lack of symmetry.
- Bilateral Symmetry: Symmetry along one plane.
Related Phrases and Concepts
- Pentamerous Radial Symmetry: A specific type common in echinoderms (like starfish), where the body is arranged in five parts around the axis.
- Axis of Symmetry: The central line around which the symmetrical parts are arranged.
Noun
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the property of symmetry about an axis
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the starfish illustrates radial symmetry
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