"tailfin" in the noun sense
1. vertical stabilizer, vertical stabiliser, vertical fin, tail fin, tailfin
a stabilizer that is part of the vertical tail structure of an airplane
2. tail fin, tailfin, fin
one of a pair of decorations projecting above the rear fenders of an automobile
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License