Definitions for oilbirdˈɔɪlˌbɜrd
Random House Webster's College Dictionary
a nocturnal cave-nesting bird of tropical South America, Steatornis caripensis, akin to the goatsuckers: the rendered fat of its young has been used as a cooking and lighting oil.
Origin of oilbird:
oilbird, guacharo, Steatornis caripensis(noun)
nocturnal fruit-eating bird of South America that has fatty young yielding an oil that is used instead of butter
Steatornis caripensis, a nocturnal South American bird related to the nightjars that feeds on the fruit of the oil palm and tropical laurels.