GNU Collaborative International Dictionary of English
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Found one definition
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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
- (Bot.) A cavity in the cellular tissue of plants, containing air only.