tailfin

Plural: tailfins

Noun

• a stabilizer that is part of the vertical tail structure of an airplane
• one of a pair of decorations projecting above the rear fenders of an automobile
• A fin at the tail of a fish, caudal fin
• A fin on the tail of an aircraft, vertical stabilizer
• A fin-like projection at the rear of a car, common on American cars of the 1950s.

Synonyms

fin, tail fin, vertical fin, vertical stabiliser, vertical stabilizer