PLEXUS Meaning of PLEXUS in English plex ‧ us /ˈpleksəs/ BrE AmE noun [ Date: 1600-1700 ; Language: Latin ; Origin: past participle of plectere 'to weave together' ] ⇨ ↑ solar plexus Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012