The Comprehensive Aramaic Lexicon

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PJ Num22:28 :מנא ובירא וחוטרא דמשה ושמירא וקשתא וענני יקרא ופום ארעא וכתב לוחי קימא ומזיקי ופום ממלל אתנא : manna and the well (at Massa and Meribah) and Moses' staff and the šamir and the rainbow and the clouds of glory and the opeing in the earth (that swallowed Qorah) and the writing on the tablets of the covenant and the demons and the speaking mouth of (Balaam's) ass

See the entire entry for šāmīr, šāmīrā n.m. flint, adamant; stone-cutting worm