blowhole

  1. Noun.  The spiracle, on the top of the head, through which cetaceans breath.
  2. Noun.  A vent for the escape of gas.
  3. Noun.  A top-facing opening to a cavity in the ground very near an ocean's shore, that leads to a marine cave from which wave water and/or bursts of air are expelled.
  4. Noun.  An unintended cavity filled with air in a casting product.
  5. Noun.  A vertical opening in the top of computer cases, that let hot air, primarily from the CPU heat sink, escape quickly.

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This entry was last updated on RefTopia from its source on 3/20/2012.