Proto-IE: *(e)regʷ-
Meaning: darkness, twilight
Tokharian: A arkant-, B erkent- 'black' (PT *erkent-) (Adams 95); A orkäm, B ork(a)mo 'darkness, dark' (PT *orkmo) (123)
Old Indian: rájas- n. `sphere of vapour or mist, region of clouds, atmosphere; vapour, mist, clouds, gloom, darkness'
Armenian: erek, erekoy `Abend'
Old Greek: érebos n. `Dunkel der Unterwelt, Totengrund'
Russ. meaning: темнота, сумерки
piet-meaning,piet-tokh,piet-ind,piet-arm,piet-greek,piet-germ,piet-rusmean,piet-refer,