Main Entry: ¹fin

Pronunciation: \ˈfin\

Function: noun

Etymology: Middle English finn, from Old English

Date: before 12th century

1 : an external membranous process of an aquatic animal (as a fish) used in propelling or guiding the body — see fish illustration
2 : something resembling a fin: as a : hand, arm b (1) : an appendage of a boat (as a submarine) (2) : an airfoil attached to an airplane for directional stability c : flipper 1b d : any of the projecting ribs on a radiator or an engine cylinder

— fin·like \-ˌlīk\ adjective

— finned \ˈfind\ adjective