RhymeZone: winglet definitions

Definitions of winglet:

noun: A little wing.
noun: (aeronautics) A winglike structure at a wingtip set at an angle to the plane of the wing designed to reduce drag by its effect on wingtip vortices.
noun: The bastard wing or alula of a bird.
noun: The pterygium of a weevil.

(Definitions from Wiktionary)