rewk-

“to be bright, light”

Debatednaturelight

light, bright, luminous

Root for brightness, yielding English light-related words, possibly related to *lewk-.

(s)teh₂n-“to thunder”Hreg-“to wet, to rain”H₂eydʰ-“to burn, to kindle a fire”angʷʰi-“eel, snake, water-serpent”bʰeh₂-w-“to shine forth, to appear”bʰerǵ-eyo-“to keep brightening, shining”bʰerǵ-s-“to protect by enclosing”bʰew-sis-“nature, growth, being”

*rewk- "to be bright, light" — Proto-Indo-European