Mmbtu

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    one million BTUs

Etymology

Replaced the earlier MBtu (one thousand BTUs) as the 'M' could be misinterpreted as the SI prefix mega- (one million) or milli- (one thousandth)

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.