Arabic

zˀm - presser une plaie de manière que le pus en sorte, le sang se dessèche et forme une croûte (to squeeze a wound so that the pus comes out, the blood dries up and forms a scab) (BK 1 967)

May be related with -ˀ- as a triconsonantizer and a specific semantic development.

PWS
*zam- - blood (SED I No. 296)