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  1. British thermal unit love

Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. The quantity of heat required to raise the temperature of one pound of water from 60° to 61°F at a constant pressure of one atmosphere.
  2. n. The quantity of heat equal to 1/180 of the heat required to raise the temperature of one pound of water from 32° to 212°F at a constant pressure of one atmosphere.

Wiktionary

  1. n. The quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at a particular temperature (there are several different precise definitions) and a pressure of one atmosphere.

WordNet 3.0

  1. 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

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‘British thermal unit’ has been looked up 365 times, added to 1 list, and is not a valid Scrabble word.