from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. hook-billed; having the upper mandible longer than the lower one
from the GNU version of the Collaborative International Dictionary of English
- adj. Hook-billed; having the upper mandible longer than the lower.
from The Century Dictionary and Cyclopedia
- In ornithology, hook-billed; having the end of the upper mandible decurved over and beyond that of the lower one, as a bird of prey, parrot, petrel, or gull.
epi- + -gnathous (Wiktionary)