Where does “լուսատարի” come from?

լուսատարի (Armenian) comes from Armenian լույս, from Old Armenian լոյս, from Proto-Indo-European lewkós, from Proto-Indo-European lewk- — bright; to shine; to see.

լուսատարի (Armenian): light year

Definitions

light year

Ancestry of “լուսատարի”, step by step

լուսատարի traces back through two separate lines of ancestry.

via Armenian լույս

Step	Language	Word	Meaning
1	Armenian	լույս	light; dawn, daybreak; electricity, power
2	Old Armenian	լոյս	light; brightness, splendour; fire; illumination;...
3	Proto-Indo-European	lewkós	bright; shining
4	Proto-Indo-European	lewk-	bright; to shine; to see

via Armenian տարի

Step	Language	Word	Meaning
1	Armenian	տարի	year
2	Old Armenian	տարի	year
3	Akkadian	??	a long time; perpetuity, eternity

Every word from Proto-Indo-European lewk- →Every word from Proto-Indo-European lewkós →Every word from Old Armenian լոյս →