Tail Fin Definition

noun
A movable fin that forms the tail of a fish, the fluke of a whale, etc.
Webster's New World
A fixed or adjustable fin on the rear of a rocket, car, etc.
Webster's New World
A fin at the tail end of an aerodynamic or hydrodynamic object such as an airplane or surfboard, used to provide directional control or stability.
American Heritage Medicine

Alternative spelling of tailfin.

Wiktionary
Synonyms:

Other Word Forms of Tail Fin

Noun

Singular:
tail fin
Plural:
tail-fins

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Unscrambles

tail fin