Air Hole Definition

noun
A hole or opening that allows for the passage of air, especially to facilitate breathing.
American Heritage
A hole that permits passage of air.
Webster's New World
An unfrozen or open place in ice covering a body of water.
Webster's New World

Air pocket.

Webster's New World

A hole in any surface that allows air or other gases to pass, especially an opening in the surface of a frozen lake etc.

Wiktionary
Synonyms: