endometrioma

noun
en·​do·​me·​tri·​o·​ma | \ -ˌmē-trē-ˈō-mə How to pronounce endometrioma (audio) \
plural endometriomas also endometriomata\ -​mət-​ə How to pronounce endometriomata (audio) \

Medical Definition of endometrioma

1 : a tumor containing endometrial tissue
2 : endometriosis used chiefly of isolated foci of endometrium outside the uterus

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