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Dictionary.com Unabridged (v 1.1)Cite This Source
blow·hole    Audio Help   [bloh-hohl] Pronunciation Key
–noun
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.Metallurgy. a defect in a casting or ingot caused by the escape of gas.
5.Geology. a hole in a sea cliff or coastal terrace through which columns of spray are jetted upward.
[Origin: 1685–95; blow2 + hole]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

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