- a fixed or adjustable fin on the rear of a rocket, car, etc.sometimes written tail′fin·
- Zool. a movable fin that forms the tail of a fish, the fluke of a whale, etc.
- A fin at the posterior part of the body of a fish, crustacean, whale, or other aquatic animal.
- An ornamental projection shaped like a fin on the rear fender of an automobile. Also called fin1.
1959 Cadillac Fleetwood Sixty Special
(plural tail fins)
- Alternative spelling of tailfin.