an air or gas vent, especially one to carry off fumes from a tunnel, underground passage, etc.
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.
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How to use blowhole in a sentence
Along the way, she recorded when the whales breathed and if seawater covered their blowholes.
One team has just shown for the first time that seawater enters whale blowholes.
If true, it would mark the first evidence of seawater entering blowholes.
The single blowhole is located well to the left of the midline and far forward on the head.
The huge, distinctly box-shaped head and the position of the single blowhole to the left front of the head are unmistakable clues.
The body is long and slender, and the head is narrow and gently tapered from the area of the blowhole forward.
In any case, be careful to leave the blowhole free so that the animal can breathe.
The blowhole was large and somewhat unsymmetrically placed, the right angle being the more anterior.The Beaked Whales of the Family Ziphidae | Frederick True
British Dictionary definitions for blowhole
the nostril, paired or single, of whales, situated far back on the skull
a hole in ice through which whales, seals, etc, breathe
a vent for air or gas, esp to release fumes from a tunnel, passage, etc
NZ a hole emitting gas or steam in a volcanic region
a bubble-like defect in an ingot resulting from gas being trapped during solidification
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