Proto-IE: *lāp-
Meaning: to shine
Hittite: lap- (I) `glühen', lapnu- `in Glut versetzen, anfachen', lappija- c. 'Glut' (Friedrich 127)
Old Greek: lámpō, aor. lámpsai̯, ps. lamphthē̂nai̯, pf. (prs.-Bed.) lélampe `leuchten, glänzen', lampró- `leuchtend, glänzend'; ep. lampetáōn `leuchtend'; lamptḗr m. `Leuchter, Fackel, Laterne', lámpsi-s f. `das Leuchten'
Celtic: *lass- > OIr lassaim `flamme', lassair `Flamme'; Cymr llachar `glänzend'
Russ. meaning: светить