endometriosis
noun/ˌɛndoʊˌmiːtriˈoʊsɪs/
Frequency rank: #16,813 most common English word
Meaning
A medical condition in which tissue similar to the lining of the uterus grows outside the uterus, often causing pain and fertility problems.

Example sentence
Her doctor confirmed that she had endometriosis after reviewing the results of her laparoscopy.
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