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hypognathous
hypognathous adj.
Brit. 
/hʌɪˈpɒɡnəθəs/
, /hʌɪˈpɒɡnəθəs/U.S. /haɪˈpɑɡnəθəs/
[Greek γνάθος jaw] Ornithology having the under mandible longer than the upper./haɪˈpɑɡnəθəs/ΚΠ
1872 E. Coues Key to N. Amer. Birds 323 Rhynchopinæ, Skimmers. Bill hypognathous.
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