furnace

noun

fur·​nace ˈfər-nəs 

: an enclosed structure in which heat is produced (as for heating a house or for reducing ore)

Examples of furnace in a Sentence

Recent Examples on the Web

On a tour of the buildings, for instance, Ganjehei shows off a furnace where the silent film legend used to burn outtakes, after examining dailies in his screening room right across the front entrance. —Chris Willman, Variety, 5 Jan. 2026

Chaplin holds many vestiges of its former ownership, from an old saw mill and furnace from when Chaplin was making his films, to his footsteps, to a gigantic set of muppet eyes overlooking the soundstage room. —Ethan Millman, HollywoodReporter, 5 Jan. 2026

His friend Jo Dusatho told the Omaha World-Herald that Jones was using a generator in the basement, as his furnace was not working. —Brendan Le, PEOPLE, 5 Jan. 2026

Inspectors can flag potential problems for you, especially the more costly repairs like replacing a roof or furnace. —Andrea Beck, Better Homes & Gardens, 4 Jan. 2026

Word History

Etymology

Middle English fourneyse, fornes, furneis "oven, kiln, furnace," borrowed from Anglo-French furneis, fornays, fornaise (continental Old French forneis —attested once as masculine noun— fornaise, feminine noun), going back to Latin fornāc-, fornāx (also furnāx) "furnace, oven, kiln (for heating baths, smelting metal, firing clay)," from forn-, furn-, base of furnus, fornus "oven for baking" + -āc-, -āx, noun suffix; forn- going back to Indo-European *g^whr̥-no- (whence also Old Irish gorn "piece of burning wood," Old Russian grŭnŭ, gŭrnŭ "cauldron," Russian gorn "furnace, forge," Bosnian-Croatian-Serbian gŕno "coals for heating iron at a smithy," Sanskrit ghṛṇáḥ "heat, ardor"), suffixed derivative of a verbal base *g^wher- "become warm" — more at therm

Note: The variation between -or-, the expected outcome of zero grade, and -ur- in Latin has been explained as reflecting a rural/dialectal change of o to u, borrowing from Umbrian, or the result of a sound change of uncertain conditioning; see most recently Nicholas Zair, "The origins of -urC- for expected -orC- in Latin," Glotta, Band 93 (2017), pp. 255-89.

First Known Use

13th century, in the meaning defined above

Phrases Containing furnace

• blast furnace
• reverberatory furnace

Rhymes for furnace

• externus

Kids Definition

furnace

noun

fur·​nace ˈfər-nəs 

: an enclosed structure in which heat is produced (as for heating a house or melting metals)