zygomorphichttp://www.oed.com/dictionary/zygomorphic_adj%3Ftab%3Dmeaning_and_usezygomorphic, adj.
First published 1921; not fully revised

zygomorphicadjective

Botany.
  1. 1875–
    Applied to a flower that is symmetrical about a single plane, i.e. divisible into similar lateral halves in only one way; = monosymmetrical adj.
    1. 1875
      In Orchids both whorls are developed in a petaloid, and like the whole flower in a zygomorphic or monosymmetrical manner.
      A. W. Bennett & W. T. T. Dyer, translation of J. von Sachs, Text-book of Botany 526

zygomorphic, adj. was first published in 1921; not fully revised.

zygomorphic, adj. was last modified in July 2023.