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1680s, Modern Latin, literally "braid, network," noun use of past participle of Latin plectere "to twine, braid, fold" (see complex (adj.)); used of a network, such as solar plexus "network of nerves in the abdomen" (see solar). Related: Plexal.
plexus plex·us (plěk'səs)n. pl. plexus or plex·us·es
A structure in the form of a network, especially of nerves, blood vessels, or lymphatics.
A combination of interlaced parts; a network.