blowholes

noun

  1. 1

    The spiracle, on the top of the head, through which cetaceans breathe.

  2. 2

    A vent for the escape of gas.

  3. 3

    A top-facing opening to a cavity in the ground very near an ocean's shore, leading to a marine cave from which wave water or bursts of air are expelled.

  4. 4

    An unintended cavity filled with air in a casting product.

  5. 5

    A vertical opening in the top of computer cases, that let hot air, primarily from the CPU heat sink, escape quickly.

verb

  1. 1

    To fill or be filled with air in an unintended cavity.

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