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zygomorphic zy·go·mor·phic (zī'gə-môr'fĭk, zĭg'ə-) or zy·go·mor·phous (-fəs)
Bilaterally symmetrical. Used of organisms or parts.
Relating to a flower that can be divided into equal halves along only one line; bilaterally symmetrical. The flowers of the iris and the snapdragon are zygomorphic. Compare actinomorphic.