Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • abbreviation British thermal unit

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • initialism British Thermal Unit

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a unit of energy equal to the work done by a power of 1000 watts operating for one hour
  • 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

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