ZYGOMORPHIC
zygomorphic, bilaterally symmetrical, zygomorphous
(adjective) capable of division into symmetrical halves by only one longitudinal plane passing through the axis
Source: WordNet® 3.1
Etymology
Adjective
zygomorphic (comparative more zygomorphic, superlative most zygomorphic)
(biology) having bilateral symmetry
Source: Wiktionary
Zyg`o*mor"phic, Zyg`o*mor"phous, a. Etym: [Gr. (Biol.)
Definition: Symmetrical bilaterally; -- said of organisms, or parts of
organisms, capable of division into two symmetrical halves only in a
single plane.
Source: Webster’s Unabridged Dictionary 1913 Edition