1. (Anat.)
Defn: An air sac, sometimes double or variously lobed, in the visceral cavity of many fishes. It originates in the same way as the lungs of air-breathing vertebrates, and in the adult may retain a tubular connection with the pharynx or esophagus.
2. A sac or bladder full of air in an animal or plant; also an air hole in a casting.
AIR BRAKE
Air" brake`. (Mach.)
Defn: A railway brake operated by condensed air. Knight.
AIR BRUSH
Air brush.
Defn: A kind of atomizer for applying liquid coloring matter in a spray by compressed air.
AIR-BUILT
Air"-built`, a.
Defn: Erected in the air; having no solid foundation; chimerical; as, an air-built castle.
AIR CELL
Air" cell`.