Mandaic

širiana - vein, artery, membrane, fibre (MD 463)

According to MD, from Arb., which is unlikely in the light of the rest of Arm. data.

PS
*ŝVry/w/ˁ-, *ŝVry/ ˁ-ān- - (Achilles) tendon; sinew, muscle (of leg) (SED I No. 268)
A very difficult case (v. SED I).