Usually means: Protruding aerodynamic stabilizers on vehicles.
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We found 7 dictionaries that define the word tailfins:

General (6 matching dictionaries)
  1. tailfins: Collins English Dictionary
  2. tailfins: Vocabulary.com
  3. tailfins: Wordnik
  4. tailfins: Wiktionary
  5. tailfins: Dictionary.com
  6. Tailfins: Wikipedia, the Free Encyclopedia

Slang (1 matching dictionary)
  1. tailfins: Urban Dictionary

(Note: See tailfin as well.)

Definitions from Wiktionary (tailfin)

noun:  A fin at the tail of a fish, caudal fin
noun:  A fin on the tail of an aircraft, vertical stabilizer
noun:  (automotive) A fin-like projection at the rear of a car, common on American cars of the 1950s.
▸ Also see tailfin


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