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1. A stabilizer that is part of the vertical tail structure of an aeroplane
   - vertical stabilizer, vertical stabiliser [Brit], vertical fin, tail fin
    
2. One of a pair of decorations projecting above the rear fenders of an automobile
   - tail fin, fin

1. The tail of fishes and some other aquatic vertebrates
   - caudal fin

Derived forms: tail fins, tailfins

Type of: decoration, fin, ornament, ornamentation, stabiliser [Brit], stabilizer

Part of: auto [informal], autocar [archaic], automobile [N. Amer], car, fish, motorcar, vertical tail, wheel [informal], whip [US, informal]

Encyclopedia: Tailfin