λευκαίνωleukaínō, lyoo-kah'-ee-no; from G3022; to whiten:—make white, whiten.
Thayer's Greek Lexicon
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STRONGS G3021:
λευκαίνω: 1 aorist ἐλευκανα (cf. Winers Grammar, § 13, 1 d.; Buttmann, 41 (35)); (λευκός); from Homer down; the Sept. for הִלְבִּין; to whiten, make white: τί, Mark 9:3; Revelation 7:14.