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heavenward
heaves
heavier-than-air
heavily
heaving
Heaviside layer
heavy
heavy breather
heavy chain
heavy cream
heavy-duty
heavy-footed
heavy goods vehicle
heavy-handed
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heavy hitter
heavy hydrogen
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heavy water
heav·y wa·ter


noun 
Definition:
 
water with deuterium not hydrogen: water that has had its hydrogen atoms replaced with the hydrogen isotope deuterium. Use: nuclear reactors. D2O
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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