Plex″us (?), n.; pl. L. Plexus, E. Plexuses (#). [L., a twining, braid, fr. plectere, plexum, to twine, braid.] 1. (Anat.) A network of vessels, nerves, or fibers.
2. (Math.) The system of equations required for the complete expression of the relations which exist between a set of quantities. Brande & C.