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A cavity in the cellular tissue of plants, containing air only.

One of the air cells of algals.

of birds, which are filled with air and connected with the air passages of the lungs; an air cell.

A small depression, sac, or vesicle, as the socket of a tooth, the air cells of the lungs, the ultimate saccules of glands, etc.

ing aorta, accompanying the bronchia in all their ramifications. -- Bronchial cells, the air cells terminating the bronchia. -- Bronchial glands, glands whose functions are unknown, seated along the bronchia. -- Bronchial membrane, the mucous membrane lining the bronchia. -- Bronchial tube, the bronchi, or the bron…

sema of the lungs, Pulmonary emphysema (Med.), a common disease of the lungs in which the air cells are distended and their partition walls ruptured by an abnormal pressure of the air contained in them.

Between alveoli; as, the interalveolar septa between adjacent air cells in the lungs.

A little sac or vesicle, as the air cell of fucus, or seaweed.

A small air cell, or globular space, in the interior of organic cells, either containing air, or a pellucid watery liquid, or some special chemical secretions of the cell protoplasm. Contractile vacuole. (Zoöl.) See under Contractile, and see Illusts. of Infusoria, and Lobosa. -- Food vacuole. (Zoöl.) See under Food,…

Of or pertaining to vesicles; esp., of or pertaining to the air vesicles, or air cells, of the lungs; as, vesicular breathing, or normal breathing, in which the air enters freely the air vesicles of the lungs.

Having the power of breathing impaired by the rupture, dilatation, or running together of air cells of the lungs, so that while the inspiration is by one effort, the expiration is by two; affected with pulmonary emphysema or with heaves; -- said of a horse. Youatt.