Meaning of bilateral symmetry

bilat'eral sym'metry

Pronunciation: [key]
— Biol. Biol.
  1. 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. Cf. radial symmetry.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.