Where does “աղուոր” come from?

աղուոր (Middle Armenian) comes from Old Armenian աղու, from Old Armenian -ու, from Proto-Indo-European -usyā, from Proto-Indo-European -wes.

Ancestry of “աղուոր”, step by step

Step	Language	Word	Meaning
1	Old Armenian	աղու	soft, sweet, agreeable, affable; delicious,...
2	Old Armenian	-ու	Forming adjectives; found in a few words, such as...
3	Proto-Indo-European	-usyā	—
4	Proto-Indo-European	-wes	—