LATIN DICTIONARYLexicon Latīnum
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“furnace” in Latin

The English word furnace itself goes back to Latin furnus, through fornāx.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

furnace
fornax (to which the adjective may be added, to denote what it is used for; e.g., Plin., 17, 19, 6, calcaria fornax).
IMPROPR., The furnace of affliction, (quasi) faces doloris or dolorum (Cic.). Anybody is tried in the furnace of affliction, *alicujus pectus dolorum quasi facibus admotis exploratur or purgatur, or *alicujus scelus dolorum quasi igne exuritur (after Verg., Aen., 6, 742).

Quick answer

What is the Latin word for furnace?
The usual Latin words for “furnace” are fornāx, dolor, pūrgō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.