Syn`er·get'ic adjective [ Greek ..., from ... to work together; sy`n with + 'e`rgon work.] Working together; coöperating; as, synergetic muscles. Found on http://www.encyclo.co.uk/webster/S/266
synergisticadjective working together; used especially of groups, as subsidiaries of a corporation, cooperating for an enhanced effect; `a synergistic effect` Found on https://www.encyclo.co.uk/local/20974