Mehri

ḳāṣəm - coldness; cold (ML 240)

“Nearly all attestations of ḳāṣəm refer to substances which become cold after being hot or warm, which correlates nicely with the meaning of the cognate root in Soqotri” (For detailed discussion see Kogan 2015:492-493).

Proto-MSA
*ḳṣm - to be cold (Kogan 2015:542)
The origin is uncertain.