-ˈōsə̇s noun
( plural endometrioses )
Etymology: New Latin, from endometri- + -osis
: the presence of functioning endometrial tissue in places where it does not belong especially where (1) invading the myometrium or (2) forming multiple foci and invading any organ within the pelvic cavity — called also respectively (1) internal endometriosis, adenomyosis; (2) external endometriosis