There's a link for an online Classical Armenian dictionary. Cool.
I have to refresh my memory, but I remember that someone (the Mekhetarists?) put out a dictionary in Grabar, Ecclesiastical Greek and Latin. I wonder if it is online.
The dictionary you are searching (Nor Bar'girk' haykazean lezui, 2 volumes, Venice, 1836-37) is digitized and put online but the access is by subscription. The link of the dictionary is this - http://www.sd-editions.com/AnaServer?lalt+0+start.anv+id=Norbarg
The dictionary is in Armenian and there are examples from medieval texts for almost all words. But it doesn't provide with the Greek and Latin equivalents of all words, only some.