Where does “kamar” come from?

kamar (Khalaj) comes from Persian کمر, from Pahlavi 𐫞𐫖𐫡, from Proto-Iranian kamarā-, from Proto-Iranian kamárati, from Proto-Indo-Iranian *kmárati, from Proto-Indo-European kh₂em- — to bend, to curve.

kamar (Khalaj): hillside

Definitions

hillside

Ancestry of “kamar”, step by step

Step	Language	Word	Meaning
1	Persian	کمر	waist; girdle, belt; the middle of a mountain
2	Pahlavi	𐫞𐫖𐫡	—
3	Proto-Iranian	kamarā-	something curved
4	Proto-Iranian	kamárati	—
5	Proto-Indo-Iranian	*kmárati	—
6	Proto-Indo-European	kh₂em-	to bend, to curve

Every word from Proto-Indo-European kh₂em- →Every word from Proto-Indo-Iranian *kmárati →Every word from Proto-Iranian kamárati →