Plethora Core is a mnemosyne-based Desktop distribution, for the undecided user, including different Desktop Enviroments, also different mail clients, and different Office Suites.
In medicine, plethora refers to a general increase in the volume of blood. In other contexts it means an overabundance or surfeit.
The 'Core' ending, is just because it sounds similar to a well known generic and bloated distribution, Fedora Core.
Browse the source at http://git.opensde.net/mnemosyne/plethora