air-hole

air hole

noun
1.
an opening to admit or discharge air.
2.
a natural opening in the frozen surface of a river or pond.

Origin:
1760–70

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
air hole
 
n
1.  a hole that allows the passage of air, esp for ventilation
2.  a section of open water in a frozen surface
3.  a less common name for air pocket

Collins English Dictionary - Complete & Unabridged 10th Edition
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