zygodactylhttp://www.oed.com/dictionary/zygodactyl_adj%3Ftab%3Dmeaning_and_usezygodactyl, adj. & n.
First published 1921; not fully revised

zygodactyladjective & noun

Ornithology.
  1. adjective
    1. 1831–
      Having the toes ‘yoked’ or arranged in pairs, i.e. two before and two behind, as the feet of a scansorial bird, or the bird itself; yoke-toed.
      1. 1831
        By the structure of their toes, which are partially zygodactyle (the intermediate ones being turned forwards, and the two lateral ones most commonly taking the opposite direction).
        Gardens & Menagerie Zool. Society: Birds 73
      2. 1890
        The arrangement of toes in pairs, two before and two behind,..is called zygodactyl or zygodactylous.
        E. Coues, Handbook Field & General Ornithology 187
  2. noun
    1. 1890–
      A yoke-toed bird.
      1. [1842
        Zygodactyles, the name given by M. Temminck to an order of Climbing Birds.
        W. T. Brande, Dictionary of Science, Literature & Art 1343/2]
      2. 1890
        The true hind toe is wanting, the outer anterior one being reversed as usual in zygodactyls.
        E. Coues, Handbook Field & General Ornithology 188

zygodactyl, adj. & n. was first published in 1921; not fully revised.

zygodactyl, adj. & n. was last modified in July 2023.