köken: From Proto-Finnic *külmä (compare Estonian külm), probably from Proto-Finno-Permic *külmä (compare Ter Sami kallm, Erzya кельме (keľme), Eastern Mari кылме (kylme)), which is possibly an Indo-European borrowing (compare Pre-Baltic *gu̯el(u)mā, Pre-Balto-Slavic *gʷel(h₁)-mo-, both of which derive from Proto-Indo-European *gel-).