Online Medical Dictionaries
http://www.mpip.org/frameset.shtml?tools/glossifier/gloss.html - recommended!
http://www.intelihealth.com/IH/ihtIH/WSIHW000/9276/9276.html?k=tnavx408x9276
http://www.medterms.com/Script/Main/hp.asp
http://www.graylab.ac.uk/cgi-bin/omd?query=stress&action=Search
http://mel.lib.mi.us/health/health-dictionaries.html