An Etymological Dictionary of the German Language/licht

by Friedrich Kluge

licht, adj., ‘light, luminous,’ from MidHG. lieht, OHG. lioht, adj., ‘bright, radiant, shining’; corresponding to AS. leóht, E. light, adj.; Goth. *liuhts, ‘bright,’ may be inferred from its derivative liuhtan, ‘to give light’ (see leuchten). It is questionable whether the dental licht is of particip. origin. as in alt, falt, laut, &c.