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Latin furnus
← Proto-Indo-European *gʷʰer- (root)
← Proto-Indo-European *gʷʰr̥-nós (inherited)
← Proto-Indo-European *gʷʰer- (mention)
← Proto-Italic *fornos (inherited)
← Latin formus (mention)
← Russian горн (cognate)
← Old Irish gorn (cognate)
← Albanian zjarr (cognate)
← Old Armenian ջերմ (cognate)

→ English Fornicalia (mention)
→ English fornacite (cognate)
→ English hornito (derived)
→ Hijazi Arabic فرن (derived)
→ Arabic فرن (derived)
→ Asturian fornu (inherited)
→ Catalan forn (inherited)
→ Catalan forner (derived)
→ Catalan fornell (mention)
→ Welsh ffwrn (derived)
→ Greek φούρνος (mention)
→ Esperanto forno (mention)
→ Spanish hornear (derived)
→ Spanish horno (inherited)
→ Spanish hornillo (inherited)
→ French four (inherited)
→ French fourneau (inherited)
→ Friulian fôr (inherited)
→ Irish sorn (derived)
→ Scottish Gaelic sòrn (derived)
→ Galician forno (inherited)
→ Galician furna (inherited)
→ Manx sorn (derived)
→ Istriot furno (inherited)
→ Italian forno (inherited)
→ Italian fornello (inherited)
→ Italian fornaio (derived)
→ Georgian ფურნე (derived)
→ Cornish forn (borrowed)
→ Latin fornax (mention)
→ Latin furnaceus (affix)
→ Latin furnarius (suffix)
→ Latin Furnius (affix)
→ Ligurian fórno (inherited)
→ Maltese forn (derived)
→ Norman four (inherited)
→ Norman fou (inherited)
→ Occitan forn (inherited)
→ Mezquital Otomi ornu (derived)
→ Old Occitan forn (inherited)
→ Old Occitan fornel (inherited)
→ Portuguese forno (inherited)
→ Portuguese furna (inherited)