http://www.perseus.tufts.edu/hopper/morph?l…y=ei)/dwlon&i=1
Here's the Perseus entry (with links to LSJ and other dictionaries) for the original Greek term for Epicurus's "images".
I find it interesting that the term came to be used for "idols" of gods in the New Testament. They sound the same-ish: idol/eidōlon, but also that idols are "images" of the gods or reflections of them.