G3021
λευκαίνω
to bleach
λευκαίνω (λευκός), [in LXX: Psa.51:7, Isa.1:18 (לָבַן hi.), etc. ;] to whiten, make white: with accusative of thing(s), Mrk.9:3, Rev.7:14.† (AS)
The KJV translates G3021 in the following manner:
made (2x), them (2x), white (2x)
Full Thayer's lexicon entry
λευκαίνω — leukaínō
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, Mar 9:3; Rev 7:14.
STRONGS NT 3021a: λευκοβυσσινον [λευκοβυσσινον: Rev 19:14, WH marginal reading, others βύσσινον λευκόν, see in βύσσινος.]
2 occurrences
Mark (1), Revelation of John (1)