PCS

*si(n)ṭ- - flat hand with wrist (SED I No. 236)

Hebrew

sīṭ - the distance between the tip of the thumb and that of the index finger when held apart, or between the root of the thumb and the tip of the index finger when the former is leaning against the latter (Jastrow 977)

in ha-ssīṭ

Syriac

sīṭā - palm (LSyr. 469)

Arabic

sinṭ- - wrist, bone that joins the forearm with the hand (BK I 1151)