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| blow·hole [ blṓ hl ] (plural blow·holes) |
noun |
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| Definition: |
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1. nostril of sea mammal: a nostril in the top of the head of a whale, dolphin, or similar sea mammal that allows the exchange of air from the lungs
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2. breathing hole in ice: a hole in ice where water mammals come to the surface to breathe
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3. civil engineering air vent: a vent to permit the escape of air or gas from a tunnel or passage
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4. geology hole in cave roof: a hole in the roof of a sea cave through which sea water is forced by waves
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5. metallurgy bubble in ingot: a gas pocket formed in a metal as it solidifies
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