ˌ ̷ ̷ ̷ ̷ˌmē.trēˈōmə noun
( plural endometriomas or endometrioma·ta -məd.ə)
Etymology: New Latin, from endometri- (from endometrium ) + -oma
1. : a tumor containing endometrial tissue
2. : endometriosis — used chiefly of isolated foci of endometrium outside the uterus