tail fin is a noun meaning "a stabilizer that is part of the vertical tail structure of an airplane". It carries 3 recorded senses.
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
the tail of fishes and some other aquatic vertebrates
Definitions, synonyms and semantic relations for tail fin come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.