Where does “ceasovoi” come from?

ceasovoi (Romanian) comes from Russian часово́й, from Russian час, from Old East Slavic часъ, from Proto-Slavic časъ, from Proto-Balto-Slavic keʔs-, from Proto-Indo-European k(ʷ)eh₁s-.

ceasovoi (Romanian): sentinel

Definitions

sentinel

Ancestry of “ceasovoi”, step by step

Step	Language	Word	Meaning
1	Russian	часово́й	hour
2	Russian	час	hour, o'clock, time, time of day; hours, o'clock;...
3	Old East Slavic	часъ	time; hour; happiness, luck
4	Proto-Slavic	časъ	time
5	Proto-Balto-Slavic	keʔs-	—
6	Proto-Indo-European	k(ʷ)eh₁s-	—

Every word from Proto-Indo-European k(ʷ)eh₁s- →Every word from Proto-Balto-Slavic keʔs- →Every word from Proto-Slavic časъ →