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ψάμμος, ἡ, but in Archim.Aren.1.1, al., always ὁ:—
sand, used by Hom. for ψάμαθος only in Od.12.243, later very freq., Hdt.8.71, etc.: pl., grains of sand, αἱ ἀπ' ἀλλήλων ἐσκεδασμέναι ψάμμοι S.E.P.1.130: prov., ψάμμος ἀριθμὸν περιπέφευγεν Pi.O.2.98; οἶδα δ' ἐγὼ ψάμμου τ' ἀριθμόν Orac. ap. Hdt.1.47; ἐκ ψάμμου σχοινίον πλέκειν, of labour in vain, Aristid.2.309J.; of something worthless, LXX Wi.7.9, D. Chr.77/8.30; ψάμμου ἄξιον Oenom. ap. Eus.PE5.21.

2. metallic ore used by alchemists, in pl., Olymp.Alch.p.106B., Zos.Alch. p.239 B.

II. ἡ ψ. the sandy desert of Libya, the sand, Hdt.3.25, 4.173; πλείστης ψάμμου OGI666.27 (Egypt, i A. D.). (Prob. ψαφ-μος, cf. ψαφαρός, ψῆφος, Lat. sabulum.)