From PIE *lewk- — through Germanic 'light,' through Latin 'lucid' and 'Lucifer,' through Greek 'leukemia' (white blood).
The natural agent that stimulates sight and makes things visible; electromagnetic radiation within the visible spectrum.
From Old English 'lēoht' (light, brightness, daylight), from Proto-Germanic *leuhtą (light), from PIE *lewk- (light, brightness). This root is one of the most productive in the Indo-European family: it gave Latin 'lūx' (light) and 'lūcēre' (to shine), Greek 'leukós' (white, bright), and Sanskrit 'roká-' (light). From the Latin branch alone, English inherited 'lucid,' 'elucidate,' 'translucent
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