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hydroelectric
hydrofining
hydrofluoric acid
hydrofluorocarbon
hydrofoil
hydroforming
hydrogasification
hydrogel
hydrogen
hydrogen bomb
hydrogen bond
hydrogen bromide
hydrogen carbonate
hydrogen chloride
hydrogen cyanide
hydrogen embrittlement
hydrogen fluoride
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hydrogen
hydrogen [ hdrəjən ]


noun 
Definition:
 
reactive gaseous element: a highly reactive colourless gas, the lightest element and the most abundant in the universe. Source: water, most organic compounds. Use: industrial processes, production of ammonia, reduction of metal ores to metals.
Symbol  H
[Late 18th century. < French hydrogène< Greek hudōr 'water' + French -gène (see -gen)]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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