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heterodactylous

or het·er·o·dac·tyl

[het-uh-roh-dak-tuh-luh s or het-uh-roh-dak-til]
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adjective Ornithology.
  1. having the first and fourth toes directed backward, and the second and third forward, as in trogons.

Origin of heterodactylous

First recorded in 1850–55; hetero- + -dactylous
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018