B.T.U.

noun

a unit of energy equal to the work done by a power of 1000 watts operating for one hour

• Syn: ↑kilowatt hour, ↑kW-hr, ↑Board of Trade unit

• Hypernyms: ↑work unit, ↑heat unit, ↑energy unit

• Part Meronyms: ↑watt-hour

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Physics.

British thermal unit; British thermal units.

Also, BTU, B.t.u., B.th.u., Btu.

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Btu (no periods), B.t.u., or B.T.U.,

British thermal unit or units.