καθαρεύω

A. to be clean or pure, Pl. Phd. 58b, Lg. 759c, Phld. Lib. p.9O., Porph. Abst. 4.6; of sifted grain, PPetr. 2p.2 (iii B.C.): c. gen., to be clean or free from, φόνου Pl. Ep. 357a; [κακιῶν] Phld. Rh. 1.218S.; ἁμαρτημάτων Plu. Cat.Mi. 24; ὀνείδους Luc. Am. 22; κ. πυρετοῦ to be free from fever, Gal. 7.503: hence ἡμέραι ‐εύουσαι ibid.; κ. ἀπ’ αὐτοῦ (sc. τοῦ σώματος) Pl. Phd. 67a; κ. γνώμῃ to be pure or clean in mind, Ar. Ra. 355; περί τι Plb. 6.56.15.

2. Rhet., of a writer, to be pure, correct in language, κ. τὴν διάλεκτον D.H. Lys. 2; οἱ καθαρεύοντες purists, Hdn.Gr.2.224.

3. Gramm., to be preceded by a vowel, to be 'pure' (cf. καθαρός 1.5b), A.D. Pron. 99.24, Theodos. Can. p.70H.; contain a 'pure' syllable, Hdn.Gr.2.923, Id. ap.Eust. 1859.13.