An Etymological Dictionary of the German Language/Annotated/licht

by Friedrich Kluge

licht, adjective, ‘light, luminous,’ from Middle High German lieht, Old High German lioht, adjective, ‘bright, radiant, shining’; corresponding to Anglo-Saxon leóht, English light, adjective; Gothic *liuhts, ‘bright,’ may be inferred from its derivative liuhtan, ‘to give light’ (see leuchten). It is questionable whether the dental licht is of participle origin. as in alt, falt, laut, &c.