air cell Meaning, Definition & Usage

  1. noun a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
    air sac; alveolus.

WordNet

Air" cell`
Definitions
  1. (Bot.) A cavity in the cellular tissue of plants, containing air only.
  2. (Anat.) A receptacle of air in various parts of the system; as, a cell or minute cavity in the walls of the air tubes of the lungs; the air sac of birds; a dilatation of the air vessels in insects.

Webster 1913