Lexical Definition

‎זָכַךְ‎ zâkak (zaw-kak') be clean ^H:V
a primitive root (compare ‎זָכָה‎)

be (make) clean, be pure(-r).

• to be transparent or clean (phys. or morally)

1) to be pure, be bright, be clean, be bright, clean
1a) (Qal)
1a1) to be bright, be shining
1a2) to be clean, be pure
1b) (Hiphil) to cleanse, make cleanse, make clean

Brown-Driver-Briggs

[‎זָכַךְ‎] verb be bright, clean, pure (kindred with foregoing. Only Lamentations, Job) —

Qal Perfect only 3 masculine plural ‎זַכּ֫וּ‎; —

1. be right, shining, figurative of splendour of nobles ‎נְזִירִים מִשֶּׁלֶג‎ ‎׳‎‎ז‎ Lam 4:7 (|| ‎מֵחָלָב צַחוּ‎).

2. be clean, pure in God's sight, of heavens Job 15:15, of stars Job 25:5 (|| ‎יַאֲהִיל‎ of moon; compare also ‎יִזְכֶּה‎ Job 15:14; Job 25:4). Hiph`il cleanse, only Perfect 1 singular ‎וַהֲזִכּוֺתִי בְּבֹר כַּפָּֽי׃‎ Job 9:30, figurative of making morally spotless (|| ‎הִתְרָחַצְתִּי‎).

Brown-Driver-Briggs References