endometrioma

noun
en·do·me·tri·o·ma | \-ˌmē-trē-ˈō-mə \
plural endometriomas also endometriomata\-mət-ə \

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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