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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
b.t.u. is a noun meaning "a unit of energy equal to the work done by a power of 1000 watts operating for one hour". It carries one recorded sense.
a unit of energy equal to the work done by a power of 1000 watts operating for one hour
Definitions, synonyms and semantic relations for b.t.u. come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.