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Definition of blowhole:

  1. A cavern in a cliff, at the water level, opening to the air at its farther extremity, so that the waters rush in with each surge and rise in a lofty jet from the extremity.
  2. A hole in the ice to which whales, seals, etc., come to breathe.
  3. A nostril or spiracle in the top of the head of a whale or other cetacean.
  4. An air hole in a casting.

Synonyms:

vent-hole, release, volcano, vent, venthole, outlet.

Usage examples: