Definition from Wiktionary, the free dictionary
tailfin (plural tailfins)
- A fin at the tail of a fish, caudal fin
- A fin on the tail of an aircraft, vertical stabilizer
- (automotive) A fin like projection at the rear of a car, common on American cars of the 1950s.
fin at the tail of fish
fin on the tail of an aircraft
fin like projection at the rear of a car