air exhauster (aregzas ter)

1. Same as air - escape.-2. Any apparatus, as an air-pump, exhaust-fan, suction-blower, or steam-jet, used for withdrawing hdrawing air from an inclosed place, for ventilation or for the creation of a vacuum. See air - pump, blower, fan, and ventilator. air-faucet (ar'fa set), n. A stop-cock for let ting air out or in. air-cell (ar's el), n. 1. In bot., one of the cavities in the leaves, stems, or other parts of plants, containing air. They are well seen in the bladders of seaweeds, and are found in other aquatic plants, which they serve to float. 2. In an at. and zoöl., a definite circumscribed cavity in the body, containing atmospheric air inhaled through air-pa ages which place it in direct communication with the outer air. The term is used for any such cavity, without reference to weed ( Sarga um the technical meaning of cell (which see). vulgare). An air-cell is generally of small size, if Air-cells in Gulf not microscopic, as one one of those in lung-ti ue; but it sometimes forms a great space or inflatable inclosed area, as the air-cells of birds, and is then also called air - space, air-receptacle, or pneuma to cyst. Specifically-(a) One of the small hemispherical saccules which beset the walls of the alveolar pa ages and infundibula of the lungs. Also called alveolus. (b) One of the dilatations of the trachea or air-tube in insects forming the respiratory apparatus. (c) In ornith., a pneuma to cyst; any one of the extra-pul. monary cavities of the body of a bird, containing air, which are continuous with one another and with one or more of the bronchial tubes. See pneuma to cyst.