Definition of B.th.u. in English :
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B.th.u.
see synonyms of b.th.u.Noun
1. b.th.u., british thermal unit, btu
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
WordNet Lexical Database for English. Princeton University. 2010.