Air hole /(âr" hōl`)/

Air· hole

Air hole
  1. A hole to admit or discharge air; specifically, a spot in the ice not frozen over.
  2. A fault in a casting, produced by a bubble of air; a blowhole. (Founding)
  3. A local region in the atmosphere having a downward movement and offering less than normal support for the sustaining surfaces of a flying machine, causing an airplane to drop suddenly. Same as air pocket. (Aëronautics)