say it: FUR-nuhs
furnace is a noun meaning "an enclosed chamber in which heat is produced to heat buildings, destroy refuse, smelt or refine ores, etc.". It carries one recorded sense.
an enclosed chamber in which heat is produced to heat buildings, destroy refuse, smelt or refine ores, etc.
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for furnace come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.