Plex·us n.; pl. L. Plexus, E. Plexuses
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.
3. A network; an intricate or interwoven combination of elements or parts in a coherent structure.
In the perception of a tree the reference to an object is circumscribed and directed by a plexus of visual and other presentations. --G. F. Stout.