noun, symbol ·Rare ·Advanced level

Definitions

Noun

1. 1
   Initialism of British thermal unit. abbreviation, alt-of, initialism
2. 2
   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

Symbol

1. 1
   Alternative letter-case form of BTU (“British thermal unit”). alt-of

Synonyms

All synonyms

british thermal unitb.th.u.british thermal unitcalorie

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