Proto-IE: *kāl-
Meaning: dark, black
Old Indian: kāla- `black, dark', kālī f. `black colour, ink or blacking'
Old Greek: k[ǟ]lás = nephélē ánüdros kaì kheimerinǟ̀ hēmérǟ Hsch., kelai̯nó- `schwarz, dunkel, finster'; kēlḗnē = mélaina (Hsch.)
Latin: cālīgō, -inis f. `dunkler Nebel, Rauch, Finsternis, Trübung der Augen, Schwindel'
Russ. meaning: темный, черный
References: WH