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• n  a stabilizer that is part of the vertical tail structure of an airplane
• n  one of a pair of decorations projecting above the rear fenders of an automobile

• Loewy's own car had a few special flamboyant frills: a plastic tailfin, a tiny gold grilled air scoop above the emblem on the hood, recessed door handles, porthole windows and .
• Testing his controls with a wide, lazy-S turn, Crossfield, following procedure, jettisoned the X-15's ventral tailfin, which would have interfered with extending his tail .
• Grammarwise, it is permissible to tailfin any word with the suffix meaning "in the manner of.

• vertical stabilizer
• vertical stabiliser
• vertical fin
• tail fin
• fin

News & Articles

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• First Coast Gears: 1948 marked the birth of the tailfin at Cadillac
  Tailfins may have had their automotive heyday in the late-50s but you can see their beginnings in the 40s.
  Aug. 23, 2013 - The Florida Times-Union