Where does “սենյակային” come from?

սենյակային (Armenian) comes from Armenian -ային, from Old Armenian -ային, from Old Armenian -ին, from Proto-Indo-European -eno-, from Proto-Indo-European -iHnos, from Proto-Indo-European -no- — adjectival suffix.

Ancestry of “սենյակային”, step by step

Step	Language	Word	Meaning
1	Armenian	-ային	Forms adjectives
2	Old Armenian	-ային	Forming adjectives
3	Old Armenian	-ին	forming adjectives with the meaning of location;...
4	Proto-Indo-European	-eno-	—
5	Proto-Indo-European	-iHnos	Creates adjectives of materials
6	Proto-Indo-European	-no-	adjectival suffix

Every word from Proto-Indo-European -no- →Every word from Armenian -ային →Every word from Old Armenian -ին →