air-bone gap n.
The difference between the threshold for hearing acuity by bone conduction and by air conduction.
(of an engine, aircraft, missile, etc.) to take in air from the atmosphere to oxidize the fuel for combustion. Historical Examples It is known that the swimming bladder of fishes becomes developed into the lungs of air-breathing vertebrates and man himself. Our Common Insects Alpheus Spring Packard The organs of air-breathing are called, in general, […]
noun (informal) air conditioning
- Air-conditioner lung
air-conditioner lung air-conditioner lung n. Extrinsic allergic alveolitis caused by forced air contaminated by thermophilic actinomycetes and other organisms.
- Air-entrained concrete
noun a low-density type of concrete throughout which small air bubbles are dispersed in order to increase its frost resistance: used for making roads. With 1 per cent of air, the loss of strength is approximately 5 per cent