B.T.U.


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Noun1.B.T.U. - a unit of energy equal to the work done by a power of 1000 watts operating for one hourB.T.U. - a unit of energy equal to the work done by a power of 1000 watts operating for one hour
energy unit, heat unit, work unit - a unit of measurement for work
watt-hour - a unit of energy equal to the power of one watt operating for one hour