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heterodactylous

American  
[het-uh-roh-dak-tuh-luhs] / ˌhɛt ə roʊˈdæk tə ləs /
Also heterodactyl

adjective

Ornithology.
  1. having the first and fourth toes directed backward, and the second and third forward, as in trogons.


Etymology

Origin of heterodactylous

First recorded in 1850–55; hetero- + -dactylous

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