radial symmetry

noun Biology.
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.


Origin:
1885–90

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
radial symmetry
 
n
Compare bilateral symmetry 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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
radial symmetry  
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. Compare bilateral symmetry.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
As such, they have radial symmetry and tube feet used for feeding and movement.
Our sampling was biased for single-stemmed plants with intact piths over individuals without radial symmetry.
Adults exhibit pentamerous radial symmetry, secondarily derived from a bilateral ancestor.
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