from Wiktionary, Creative Commons Attribution/Share-Alike License
- British Thermal Unit
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a unit of energy equal to the work done by a power of 1000 watts operating for one hour
- n. 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
Sorry, no etymologies found.