British thermal unit

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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
• Syn:
BTU, B.Th.U.
• Hypernyms:
work unit, heat unit, energy unit
• Part Holonyms:
therm