anisodactylous

adjective
an·iso·dac·ty·lous | \-¦daktələs\

Definition of anisodactylous 

: having unequal toes used especially of passerine and picarian birds having three toes turned forward and one backward

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First Known Use of anisodactylous

1828, in the meaning defined above

History and Etymology for anisodactylous

anis- entry 1 + -dactylous

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The first known use of anisodactylous was in 1828

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