Source : Webster's Revised Unabridged Dictionary (1913)

Hawkbill \Hawk"bill`\, n. (Zo["o]l.)
   A sea turtle ({Eretmochelys imbricata}), which yields the
   best quality of tortoise shell; -- called also {caret}.

Source : WordNet®

hawkbill
     n : pugnacious tropical sea turtle with a hawk-like beak; source
         of food and the best tortoiseshell [syn: {hawksbill
         turtle}, {hawksbill}, {tortoiseshell turtle}, {Eretmochelys
         imbricata}]