blowhole

blow•hole n.

Miningan air or gas vent, esp. one to carry off fumes from a tunnel, underground passage, etc.
Zoologyeither of two nostrils or spiracles, or a single one, at the top of the head in whales and other cetaceans, through which they breathe.
Zoologya hole in the ice to which whales or seals come to breathe.
Metallurgya defect in a casting or ingot caused by the escape of gas.
Geologya hole in a sea cliff or coastal terrace through which columns of spray are jetted upward.

Collins Concise English Dictionary © HarperCollins Publishers::

blowhole /ˈbləʊˌhəʊl/ n

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 hole in a cliff top leading to a sea cave through which air is forced by the action of the sea

'blowhole' also found in these entries (note: many are not synonyms or translations):

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blowhole down south

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