winglet

A small or rudimentary wing.

A short, almost vertical stabilizing fin projecting from the tip of an aircraft wing.

A little wing.

The pterygium, a lateral expansion on each side of the end of the rostrum, found in many weevils.

A little wing; a very small wing.

A bastard wing, or alula.

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.