Encyclopedia Britannica Online (subscription through Bishop Payne Library). http://www.search.eb.com.
Encyclopedia of Religion and Society. http://hirr.hartsem.edu/ency.
Merriam-Webster Online. http://www.m-w.com/cgi-bin/mwwed.pl. Online version of the Merriam-Webster dictionary and thesaurus.
OneLook Dictionary. http://onelook.com. A search engine of dictionaries. Searches your term in both general and specialty dictionaries and gives you a list of results.
TheoWiki. http://www.theowiki.com. A Wikipedia-inspired site that covers religious studies, theology, and biblical scholarship. Contributors are expected to distinguish between personal opinion, professional opinion, and undisputed fact. Use with caution.
Wikipedia. http://en.wikipedia.org. Free online encyclopedia that anyone can edit. Use with caution.