enterococcus
Concise Oxford English Dictionary © 2008 Oxford University Press:
enterococcus /ˌɛntərəʊˈkɒk(ə)s/
▶noun (pl. enterococci /-ˈkɒk(s)ʌɪ, -k(s)iː/) a streptococcus that occurs naturally in the intestine but can cause infection elsewhere in the body.
'enterococcus' also found in these Oxford entries:

