air hole

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

1760–70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
air hole
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The top of each observation well shall be provided with a cap in which an air
  hole has been drilled.
Prior to discarding your used oil filter, punch an air hole in the dome end of
  the filter.
The officials ordered the rescuers to dig from the air hole on top of the
The flight end cap had a rubber gasket with a marginal air hole to allow
  pressurization behind the piston.
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