Search Result for "zygodactyl": 
Wordnet 3.0

ADJECTIVE (1)

1. (of bird feet) having the first and fourth toes directed backward the second and third forward; 



The Collaborative International Dictionary of English v.0.48:

Zygodactyl \Zyg`o*dac"tyl\, Zygodactyle \Zyg`o*dac"tyle\, n.
   [See Zygodactylic.] (Zool.)
   Any zygodactylous bird.
   [1913 Webster]


WordNet (r) 3.0 (2006):

zygodactyl
    adj 1: (of bird feet) having the first and fourth toes directed
           backward the second and third forward [ant:
           heterodactyl]