the word is an entry in a late lexical list, its very form and relation to the root *ˀiṣbaˁ- is doubtful. See Streck 2002: 249.
s. Krebernik 1983: 18, Conti 1990: 148–150
Official Aramaic
ṣbˁ - certain measure of length, finger
(DNWSI 958)
Jewish Palestinian Aramaic
det. ˀṣbˁth
Jewish Babylonian Aramaic
ˀaṣbˁā - finger, esp. index finger
(Jastrow 110, DJBA 159b)
Syriac
ṣebˁā - finger, toe
(LSyr. 620, SL 1272)
Also Old Amh. ṣ̂äˁat/ ṣ̂äˀat, Littmann 1943:499.
Also Ancient Har. pl. aṭābin, Cerulli 1936:409
Gafat
ṣatä - main
(Leslau 1956:237)