en·ter·o·coc·cus I. \ˌentərōˈkäkəs\ Etymology: New Latin, from enter- + -coccus synonym of streptococcus II. noun (pluralenterococ·ci \-äˌkī, -äkē, -äkˌsī, -äksē\) : streptococcus 2; especially: a streptococcus (as Streptococcus faecalis) normally present in the intestine