The Collaborative International Dictionary
Epignathous
Epignathous \E*pig"na*thous\, a. [Epi- + Gr. gna`qos the jaw.] (Zo["o]l.) Hook-billed; having the upper mandible longer than the lower.
Wiktionary
epignathous
a. (context zoology English) hook-billed; having the upper mandible longer than the lower one