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The Collaborative International Dictionary of English v.0.48 (gcide)

Plexus \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.
[1913 Webster]

2. (Math.) The system of equations required for the complete
expression of the relations which exist between a set of
quantities. --Brande & C.
[1913 Webster]

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.
[Webster 1913 Suppl.]