GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Air cell . 
   (Bot.) A cavity in the cellular tissue of plants, containing air only.
   1913 Webster
   (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.
   1913 Webster