köken: Inherited from Middle French four, from Old French four, forz, forn, from Latin furnus, from Proto-Italic *fornos, from Proto-Indo-European *gʷʰr̥-nós, from *gʷʰer- (“warm, hot”).
aile: au four, avoir une brioche au four, enfourner, être au four et au moulin, faire un four, four à micro-ondes, gant de four, noir comme dans un four, petit four
köken: Inherited from Old Spanish forno, from Latin furnus, from Proto-Italic *fornos, from Proto-Indo-European *gʷʰr̥-nós, from *gʷʰer- (“warm, hot”).
aile: al horno, alto horno, enhornar, hornada, hornalla, hornar, hornear, horno crematorio, horno de calcinación, horno de microondas
köken: First attested in the Seokbo sangjeol (釋譜詳節 / 석보상절), 1447, as Middle Korean 가마〮 (Yale: kàmá). Possibly cognate with Japanese 窯 (kama, “kiln; oven; cauldron”). Compare also 감— (gam-, “to be black”).
köken: Inherited from Latin furnus, from Proto-Italic *fornos, from Proto-Indo-European *gʷʰr̥-nós, from *gʷʰer- (“warm, hot”). Compare Occitan forn or horn.
aile: enfornar, forn de microones, forn de pa, fornada, fornejar, forner
köken: Borrowed through Vulgar Latin from Latin furnus.
Etimoloji
From Proto-Finnic *riihi, from Proto-Finno-Permic *riŋeše, itself possibly a Wanderwort. Cognates include Estonian rehi, Karelian riihi. Swedish ria and Latvian rija are borrowings from Finnic.