ἀκέραστος

ον, Adv.
A. unmixed, pure, τόλμης ἀνδρείας Pl. Plt. 310d. Adv. ἀκεράστως, πνέων, gloss on ἀκραής, Sch. Od. 2.421.
II. of vowelsounds, not coalescing, D.H. Comp. 22.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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