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Air equivalent

a measure of the effectiveness of a material in absorbing nuclear radiation, expressed as the thickness of an air layer (at 0° C and 1 atmosphere) causing the same absorption.


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  • Air express

    an express service for shipping small packages of goods by air: includes ground pickup at origin and delivery at destination. the goods shipped by this service. to send or transport by air express: Your package will be air-expressed and should reach its destination tomorrow. pertaining to, using, or sent by air express: Your air-express package […]

  • Airfare

    the price charged for transportation by airplane. Contemporary Examples The site also has information for planning mission trips to Venezuela, including the cost for airfare and bus rides. Did Aubrey Lee Price Kill Himself, Or Is He Just Hiding in Central America? Matthew DeLuca July 11, 2012 “He has the groups cover the airfare and […]

  • Air fern

    noun a plant made of the skeletal remains of a species of marine animal, Sertularia argentea, which resembles a fern when dyed green and is distantly related to coral; also called Neptune plant Examples The self-sustaining air fern is only found at the bottom of the English Channel. Historical Examples You certainly do, said Nyoda […]

  • Airfield

    a level area, usually equipped with hard-surfaced runways, on which airplanes take off and land. Contemporary Examples An empty plot of land lay across the street that led to the airfield, where daily flights left for Sierra Leone and Guinea. My Vanished Liberia Leymah Gbowee October 6, 2011 Safwan—an Iraqi airfield just over the border […]

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