Where does “խեղանդամ” come from?

խեղանդամ (Armenian) comes from Old Armenian խեղանդամ, from Old Armenian անդամ, from Middle Iranian andām, from Proto-Iranian hamdaHma, from Proto-Indo-European sem- — together, one.

խեղանդամ (Armenian): mutilated, crippled; cripple

Definitions

mutilated, crippled; cripple

Ancestry of “խեղանդամ”, step by step

Step	Language	Word	Meaning
1	Old Armenian	խեղանդամ	mutilated, crippled
2	Old Armenian	անդամ	limb, member; the whole body
3	Middle Iranian	andām	—
4	Proto-Iranian	hamdaHma	member, limb
5	Proto-Indo-European	sem-	together, one

Every word from Proto-Indo-European sem- →Every word from Proto-Iranian hamdaHma →Every word from Middle Iranian andām →