radial symmetry

American  

noun

Biology.

1. a basic body plan in which the organism can be divided into similar halves by passing a plane at any angle along a central axis, characteristic of sessile and bottom-dwelling animals, as the sea anemone and starfish.

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radial symmetry British  

noun

1. a type of structure of an organism or part of an organism in which a vertical cut through the axis in any of two or more planes produces two halves that are mirror images of each other Compare bilateral symmetry

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radial symmetry Scientific  

1. Symmetrical arrangement of parts of an organism around a single main axis, so that the organism can be divided into similar halves by any plane that contains the main axis. The body plans of echinoderms, ctenophores, cnidarians, and many sponges and sea anemones show radial symmetry.

2. Compare bilateral symmetry

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Etymology

Origin of radial symmetry

First recorded in 1885–90

Compare meaning

How does radial-symmetry compare to similar and commonly confused words? Explore the most common comparisons:

• radial symmetry vs. bilateral symmetry

Example Sentences

In particular, starfish, also called sea stars, have fivefold radial symmetry, so the animal can be divided into five identical segments.

From Scientific American • Nov. 3, 2023

The end result, constructed at Harvard, resembled the nave of a cathedral built by aliens to worship radial symmetry, or an iron maiden for punishing giant cubes.

From New York Times • Nov. 23, 2022

Stranger still, this "handedness" is the only feature that breaks the comb jelly's radial symmetry.

From Salon • Nov. 10, 2021

Jellyfishes have what’s called radial symmetry, which can look anything like a snowflake to a disk, as long as it can be divided like a pie to produce identical pieces.

From Scientific American • Jun. 24, 2015

So too the explanation of radial symmetry and torsion of organs as due to a Pelmatozoic mode of life finds confirmation in many other phyla.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward" by Various