heterodactyl

from WordNet (r) 3.0 (2006)
heterodactyl
    adj 1: (of bird feet) having the first and second toes directed
           backward the third and fourth forward [ant: {zygodactyl}]
from The Collaborative International Dictionary of English v.0.48
Heterodactyl \Het`er*o*dac"tyl\, a. (Zool.)
   Heterodactylous. -- n. One of the Heterodactyl[ae].
   [1913 Webster]
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