From tsachach; dazzling, i.e. Sunny, bright, (figuratively) evident -- clear, dry, plainly, white.
see HEBREW tsachach
H6703. tsach
צַח adjective dazzling, glowing, clear; — צַח חֹם Isaiah 18:4 glowing heat; צַח רוּחַ Jeremiah 4:11 glowing wind; וְאָדוֺם צַח דּוֺדִי Song of Solomon 5:10 my beloved is dazzling (white) and ruddy (compare Lamentations 4:7); feminine plural צַחוֺת לְדַבֵּר Isaiah 32:4 to speak clear (words), clearly.