bilateral symmetry

noun Biology.
a basic body plan in which the left and right sides of the organism can be divided into approximate mirror images of each other along the midline.
Compare radial symmetry.


Origin:
1850–55

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World English Dictionary
bilateral symmetry
 
n
See also radial symmetry the property of an organism or part of an organism such that, if cut in only one plane, the two cut halves are mirror images of each other

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American Heritage
Medical Dictionary

bilateral symmetry n.
Symmetrical arrangement, as of an organism or a body part, along a central axis, so that the body is divided into equivalent right and left halves by only one plane.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
bilateral symmetry   (bī-lāt'ər-əl)  Pronunciation Key 
Symmetrical arrangement of an organism or part of an organism along a central axis, so that the organism or part can be divided into two equal halves. Bilateral symmetry is a characteristic of animals that are capable of moving freely through their environments. Compare radial symmetry.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
For those groups to be so different, bilateral symmetry must have been around for a while.
These three challenges revealed that starfish have a hidden bilateral symmetry, and move in a preferred direction.
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