I am Messedrocker -- you may know me from Wikipedia or Wikinews. I would like to introduce myself to the mailing list, and simultaneously tell you about my proposed project: http://meta.wikimedia.org/wiki/Medical_dictionary_wiki -- please read the whole thing before you criticise. I hope it's not bad form for my first post to be a shameless spamvertisement, but that's what Meta told me to do.
Firstly, you might be interested in the (not very active) medical wiki mailing list at http://mail.wikipedia.org/mailman/listinfo/wikimedical-l
Secondly, with the exception of the unwiki suggestion that all pages should be protected from editing, wouldn't your project duplicate Wiktionary? There's already a category for medical terms at http://en.wiktionary.org/wiki/Category:Medicine
Angela.