Proto-IE: *erkʷ- <PIH *e->
Meaning: to light up; to glorify, to sing of
Hittite: arkuwai- (I) 'beten ~ se défendre, s'excuser ~ antworten ~ die eigenen Verdienste hervorheben' (Tischler 61)
Tokharian: A yärk, B yarke 'Verehrung'; yärk- 'to honor' (Adams 484)
Old Indian: árcati `to shine; to praise, sing', arká- m. `ray, flash; religious ceremony, praise, hymn, song; singer'; r̥c- f. `praise, verse', ŕ̥kvan-, r̥kvá- `praising'
Armenian: erg `Lied'
Russ. meaning: освещать; воспевать