plethora, plethory 1. Excess; overabundance; a very large amount or number of something, especially an excess amount. 2. An excess of blood in the circulatory system or in one organ or area; especially in the facial veins, causing a ruddy complexion. 3. Etymology: a medical word for 'excess of body fluid', from Late Latin plethora, from Greek ple... Found on http://www.wordinfo.info/words/index/info/view_unit/1698/