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1. (noun) British thermal unit, BTU, B.Th.U. a unit of heat equal to the amount of heat required to raise one pound of water one degree Fahrenheit at one atmosphere pressure; equivalent to 251.997 calories
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"b.th.u.." Definitions.net. STANDS4 LLC, 2008. 5 July. 2008. http://www.definitions.net/definition/b.th.u.