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bilateral symmetry
bi·lat·er·al sym·me·try


noun 
Definition:
 
sameness of right and left sides: symmetry in which an imaginary plane divides an object into right and left halves, each side being a mirror image of the other. Most animals exhibit this symmetry.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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