PLEXUS By N., Pam M.S. - April 7, 2013 noun. a network of alike structures which are operationally or anatomically interlinked. PLEXUS: "Plexus constructs exist in the respiratory system as the brachian plexus." Related Psychology Terms THEOBROMINE CELIAC PLEXUS TISSUE BULBAR BRACHIAL PLEXUS MOTOR SYSTEM TYROSINE VENTRICLE PACKET SWITCHING BRACHIAL PLEXUS Cite this page: N., Pam M.S., "PLEXUS," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/plexus/ (accessed May 10, 2021).