Bi*lat"er*al (?), a. [Pref. bi- + lateral: cf. F. bilat'eral.]
Having two sides; arranged upon two sides; affecting two sides or two parties.
Of or pertaining to the two sides of a central area or organ, or of a central axis; as, bilateral symmetry in animals, where there is a similarity of parts on the right and left sides of the body.
© Webster 1913.