Definition of air hole in English:

air hole

noun

  • 1A hole or passage to admit air; especially a hole in a layer of ice formed over deep water, providing a breathing-place for aquatic animals or divers.

  • 2Metallurgy. A cavity in a metal casting, produced by the escape of air through the liquid metal. Now rare.

Origin

Early 17th century; earliest use found in Contract. From air + hole.

Pronunciation

air hole

/ˈɛː həʊl/