Source : Webster's Revised Unabridged Dictionary (1913)

Oilbird \Oil"bird`\, n. (Zo["o]l.)
   See {Guacharo}.

Source : WordNet®

oilbird
     n : nocturnal fruit-eating bird of South America that has fatty
         young yielding an oil that is used instead of butter
         [syn: {guacharo}, {Steatornis caripensis}]