Meaning of blowhole

blow•hole

Pronunciation: (blō'hōl"), [key]
— n.
  1. an air or gas vent, esp. one to carry off fumes from a tunnel, underground passage, etc.
  2. either of two nostrils or spiracles, or a single one, at the top of the head in whales and other cetaceans, through which they breathe.
  3. a hole in the ice to which whales or seals come to breathe.
  4. a defect in a casting or ingot caused by the escape of gas.
  5. a hole in a sea cliff or coastal terrace through which columns of spray are jetted upward.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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