Need some definitions - Merriam Webster yes like the dictionary has an online free of charge dictionary thesaurus medical dictionary and Spanish to English translator, but for the ultimate knowledge seeker become a unabridged member for $30 for one year and get so much info your brain will most likely explode... ok so maybe not but really though. but if you like etymology you be absolutely obsessed with this site, it has some pretty thorough details and sources. knowledge is power... rule the world... with Merriam Websters online information source