The abbreviation etc (formerly as &c) stands for the Latin expression et cetera (and the others, and the rest), which is related to the Greek και έτε?α (ke etera; and the others).
In modern Greek
α) έτε?ος: the other [heteros]
β) ετε?όδοξος: heterodox [heterodoxos]
More: http://ewonago.blogspot.com/2008/06/etc-et-cetera.html