blowhole - definition and synonyms

noun [countable] 

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/ˈbləʊˌhəʊl/
singularblowhole
pluralblowholes
  1. 1
    a hole in the top of the head of a sea animal such as a whale or dolphin, through which it breathes
  2. 2
    a hole in the surface of ice that sea animals such as whales and seals use to breathe through
  3. 3
    a hole in a tunnel through which gases can escape