elucidate (verb) – to make clear, to explain or clarify
BREAKDOWN: E- (completely) + LUC- (clear) + -ID (that which is) + -ATE (to make or do)
— elucidation is the act of explanation or clarification
This word is built on the root LUC-, which means light, clear, and to shine.
Common LUC- words include translucent.
More esoteric LUC- words include lucent and lucubrate.