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Definition of btu

btu

/ˌbiː tiː ˈjuː/
B · T · U
Plural:BTUs
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btu Lexical Profile

btu Game Scores & Validity

• noun

1

A traditional unit of heat energy (British thermal unit), defined as the amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit, equal to approximately 1,055 joules.

Example

"We purchased a portable air conditioner rated at 10,000 BTUs per hour to cool the upstairs bedroom."

Synonyms
View all synonyms for btu

Word Nuance & Usage

In commercial heating and cooling specifications, 'BTU' is frequently used as shorthand for 'BTUs per hour' (BTU/h) to indicate the rate of power output rather than a single static unit of energy.

• Rhymes for btu

• Nearby Words

bruv
brux
bryce
btu
bub
bubba
bubbe

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Btu. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/btu
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