fin - definition and synonyms

noun [countable] 

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/fɪn/
singularfin
pluralfins
  1. 1
    a thin flat part of a fish’s body that sticks out
     Synonyms and related words
  2. 2
    a part on the back of an aircraft that sticks out and helps it to move smoothly
  3. 3
    a thin flat part on the back of a vehicle that is used for decoration