Noun tailfin has 2 senses
  1. vertical stabilizer, vertical stabiliser, vertical fin, tail fin, tailfin - a stabilizer that is part of the vertical tail structure of an airplane
    --1 is a kind of stabilizer
    --1 is a part of vertical tail
  2. tail fin, tailfin, fin - one of a pair of decorations projecting above the rear fenders of an automobile
    --2 is a kind of decoration, ornament, ornamentation
    --2 is a part of car, auto, automobile, machine, motorcar
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