For the Mandaic astrological usage compare that of trˁ, trˁˀ n.m. at Qumran and in Syriac.
Most, if not all, of the usages and collocations are direct loans from Akkadian: cf. AIOA and CAD B s.v.
Note that the only Syriac examples occur in the magical texts and in a passage describing Mandaic beliefs (for which see Nöldeke in WZKM 12: 357ff.)