From the derived Indo-European root LEUK, which meant light or
brightness, we have inherited at least 196 modern English words, including
the following:

From Old-Middle English - light, lea (a meadow or the
place where the sun shines)
From Latin - lumen, illuminate, lunar, lunatic, luster,
illustration, lucid, translucent F
From Greek - link (an ancient name for a torch), lynx (a
name given to the animal with a light shining in its eyes)