Blow"hole`(), n. 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 nostril or spiracle in the top of the head of a whale or other cetacean.
There are two spiracles or blowholes in the common whales, but only one in sperm whales, porpoises, etc.
3. A hole in the ice to which whales, seals, etc., come to breathe.
(Founding) An air hole in a casting.
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Wed 12th December 2018