blow·hole

[bloh-hohl]
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:
1685–95; blow2 + hole

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Blowhole is always a great word to know.
So is mass. Does it mean:
unit of measurement for force
quantity of matter as determined from its weight or from Newton's second law of motion
Collins
World English Dictionary
blowhole (ˈbləʊˌhəʊl) [Click for IPA pronunciation guide]
 
n
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.  a.  a vent for air or gas, esp to release fumes from a tunnel, passage, etc
 b.  (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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

blowhole
1787, of whales and porpoises, from blow (v.1) + hole.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Unlike today's whales, it had no blowhole-the ancient behemoth had to raise its head above water to breathe.
The marine mammals must come to the surface to breathe through the blowhole on
  the tops of their heads.
The dorsal fin usually appears at the same time as the blowhole, when the
  animal surfaces to breathe.
Don't miss the blowhole, a fascinating geologic feature.
Image for blowhole
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