Phrase guide

British thermal unit

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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No pronunciation record was provided for this word.

1

noun

Meaning 1

A unit of energy that is equivalent to 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.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: unit

2

noun

Meaning 2

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

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: BTU, B.Th.U.

Antonyms: none provided

Broader terms: work unit, heat unit, energy unit

History

Etymology

No etymology was provided for this word.

Across languages

Translations

5 source translations are retained for this English entry.

  • Chinese Mandarin: 英熱單位 /英热单位 (yīngrèdānwèi) — the quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at a particular temperature
  • Irish: teasaonad Briotanach — the quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at a particular temperature
  • Korean: 영국 열량 단위 (yeongguk yeollyang danwi) — the quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at a particular temperature
  • Tagalog: Britanhing initing isahin — the quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at a particular temperature
  • Welsh: uned thermol Brydeinig — the quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit at a particular temperature