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blowhole

[bloh-hohl] /ˈbloʊˌhoʊl/
noun
1.
an air or gas vent, especially 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 of blowhole
1685-1695
1685-95; blow2 + hole
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for blowhole

blowhole

/ˈbləʊˌhəʊl/
noun
1.
the nostril, paired or single, of whales, situated far back on the skull
2.
a hole in ice through which whales, seals, etc, breathe
3.
  1. a vent for air or gas, esp to release fumes from a tunnel, passage, etc
  2. (NZ) a hole emitting gas or steam in a volcanic region
4.
a bubble-like defect in an ingot resulting from gas being trapped during solidification
5.
(geology) a hole in a cliff top leading to a sea cave through which air is forced by the action of the sea
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for blowhole
n.

also blow-hole, 1787, of whales and porpoises, from blow (v.1) + hole.

Online Etymology Dictionary, © 2010 Douglas Harper
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16
18
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