blowhole

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blowhole

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 bubble-like defect in an ingot resulting from gas being trapped during solidification
4. Geology a hole in a cliff top leading to a sea cave through which air is forced by the action of the sea
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

blowhole

[′blō‚hōl]
(geology)
A longitudinal tunnel opening in a sea cliff, on the upland side away from shore; columns of sea spray are thrown up through the opening, usually during storms.
(metallurgy)
A pocket of air or gas formed in a metal during solidification.
(vertebrate zoology)
The nostril on top of the head of cetacean mammals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

gas pocket, blowhole

A hole or void, as in a casting, which results from entrained air.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.