furnace

Etymology

It is inherited from Middle English furneis, also fornais and furnas,^{[2][3][4][5][6]} borrowed from Old French fornais, also fornaise,^{[7][8][2][9][10]} now fournaise,^[7][10][9] from Latin fornāx (“oven, kiln”),^{[7][8][11][10]} a derivative of fornus or furnus (“oven”).^{[7][12][9][13]} Hoad adds a form Vulgar Latin *fornātia for the feminine French form.^[9] The Anglo-Norman word, recorded from the early 12th century, meant a furnace or oven, including ovens for pottery, bread and glass.^[14] The Latin is related to formus (“warm”),^{[8][2][13][12]} and Etymonline and the American Heritage Dictionary trace it to Proto-Indo-European *gʷʰer- (“to heat, warm”),^[8][11] the root of warm;^[12] Klein compares Ancient Greek θερμός (thermós, “warm”) and Old English wearm.^[6] Italian fornace and Spanish hornaza come from the same Latin source.^[7][15]

Earliest recorded meaning

An enclosed structure for subjecting minerals or metals to intense heat: before 1225, in the life of Saint Juliana.^[7] Weekley notes that the first record refers to the third chapter of the Book of Daniel.^[15] Barnhart dates the word probably to about 1200.^[2][3]

Semantic evolution

In Old French the word could already mean, figuratively, the flame of love,^[8] and in English it was used figuratively from 1340 for a severe trial or a place of great heat.^[7] From about 1290 it also meant a boiler or cauldron, a sense that survived only in dialect,^[7] where the EDD records it from Northumberland to Devon for a large brewing boiler set in brickwork;^[16] in the mining districts of Northumberland and Durham a furnace was a large fire for ventilating a pit.^[16] Between about 1400 and 1616 it could be an oven giving moderate heat, as for hatching eggs.^[7] From 1660 it was used of the fire of a volcano;^[7] from 1691 it meant a closed fireplace for heating a building through hot-air or hot-water pipes, the usual sense in American English today.^[7][5] Johnson (1755) defined it simply as an enclosed fireplace.^[17] A verb furnace, to breathe out as from a furnace, appears in Chapman in 1598, and Shakespeare uses it;^[7][5] the technical verb, to heat in a furnace, dates from 1612.^[7]

Timeline

• c. 1200 – probable first date in Barnhart.^[2][3]
• c. 1225 – an enclosed structure for intense heat.^[7]
• c. 1290 – a boiler or cauldron (now dialectal).^[7]
• 1340 – figurative, a severe trial; a very hot place.^[7]
• c. 1400 – an oven for moderate heat (obsolete by 1616).^[7]
• 1598 – verb, to exhale like a furnace.^[7]
• 1612 – verb, to heat in a furnace.^[7]
• 1660 – the fire of a volcano.^[7]
• 1691 – a closed fireplace for heating a building.^[7]

Meanings

Noun

1. An enclosed structure in which great heat is produced, for smelting or refining ores, melting metals, firing pottery or burning waste.^[18][5][7]
2. An apparatus that heats a building, usually by circulating hot air or water: The furnace in the basement broke down in January.^[5][7]
3. A very hot or stifling place.^[18][7]
4. A severe trial or ordeal.^[7][5]

Verb

1. To heat something in a furnace.^[5][7]

Word family

• furnacelike
• blast furnace
• reverberatory furnace

Related words

• warm
• thermal
• fornication

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e Barnhart, Robert K., ed. (1995), The Barnhart Concise Dictionary of Etymology, New York: HarperCollins
3. ^ a b c Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
4. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
5. ^ a b c d e f g Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
6. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
7. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
8. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
9. ^ a b c d Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
10. ^ a b c Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
11. ^ a b The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
12. ^ a b c Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
13. ^ a b Skeat, Walter W. (1911), A Concise Etymological Dictionary of the English Language, new ed., Oxford: Clarendon Press
14. ^ Anglo-Norman Dictionary (AND2), Aberystwyth University, anglo-norman.net (2nd ed., 2005–)
15. ^ a b Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
16. ^ a b Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)
17. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
18. ^ a b Collins English Dictionary (2023), Glasgow: HarperCollins