bilateral symmetry

noun

, Biology.

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.

bilateral symmetry

noun

1. See 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 See also radial symmetry

bilateral symmetry

/ bī-lăt′ər-əl /

1. 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.
2. Compare radial symmetry

Word History and Origins

Origin of bilateral symmetry¹

First recorded in 1850–55

Example Sentences

All animals with bilateral symmetry, meaning their left and right sides are mirror images, share similar body plans.

From Popular-Science

The flatworms are the first animals to assume pronounced bilateral symmetry.

From Project Gutenberg

Bilateral symmetry has long been recognized as a primary principle in æsthetic composition.

From Project Gutenberg

Unequal division would thus be an instance of bilateral symmetry.

From Project Gutenberg

A bilateral symmetry is thus even at this stage clearly indicated.

From Project Gutenberg

Its bilateral symmetry is further indicated by a median longitudinal furrow.

From Project Gutenberg