endometriosis
noun
en·do·me·tri·osis
ˌen-dō-ˌmē-trē-ˈō-səs 
: the presence and growth of tissue similar to endometrium in places other than the uterus and especially in the pelvis and abdomen that often results in severe pain and infertility
Endometriosis is not malignant, but it mimics cancer in the way it spreads and attaches itself to other organs—most commonly the ovary, bladder, and bowel.—
Consumer Reports
Consumer ReportsEndometriosis is one of the leading causes of female infertility and causes great pain and life disruption.—Paul G. Donohue
Paul G. DonohueExamples of endometriosis in a Sentence
Recent Examples on the Web
The actress recently opened up about the harrowing ordeal that ended in an endometriosis diagnosis.
—Ryan Coleman, Entertainment Weekly, 12 Mar. 2026
Currently, the simulator cannot train clinicians to diagnose superficial endometriosis.
—Tanya Lewis, Scientific American, 12 Mar. 2026
Unlike endometriosis, wherein endometrial tissue grows outside the uterus, adenomyosis occurs within the uterine wall itself.
—L'oreal Thompson Payton, SELF, 6 Mar. 2026
Lowry is also hopeful that younger generations are creating more space for Black voices in the menopause conversation and says that there are more diverse perspectives happening around PCOS, endometriosis, and fertility.
—Alexa Mikhail, Flow Space, 4 Mar. 2026
See All Example Sentences for endometriosis
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Ryan Coleman, Entertainment Weekly, 12 Mar. 2026
Currently, the simulator cannot train clinicians to diagnose superficial endometriosis.
—Tanya Lewis, Scientific American, 12 Mar. 2026
Unlike endometriosis, wherein endometrial tissue grows outside the uterus, adenomyosis occurs within the uterine wall itself.
—L'oreal Thompson Payton, SELF, 6 Mar. 2026
Lowry is also hopeful that younger generations are creating more space for Black voices in the menopause conversation and says that there are more diverse perspectives happening around PCOS, endometriosis, and fertility.
—Alexa Mikhail, Flow Space, 4 Mar. 2026
See All Example Sentences for endometriosis
Cite this Entry
“Endometriosis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/endometriosis. Accessed 16 Mar. 2026.
Copy CitationMedical Definition
endometriosis
noun
en·do·me·tri·osis
ˌen-dō-ˌmē-trē-ˈō-səs
plural endometrioses
-ˌsēz
: the presence and growth of tissue similar to endometrium in places other than the uterus and especially in the pelvis and abdomen and that often results in severe pain and infertility
The primary symptoms of endometriosis are pelvic pain, dysmenorrhea, dyspareunia, backache, dyschezia, dysuria, and infertility.—G. David Adamson, The Journal of the American Medical Association
G. David Adamson, The Journal of the American Medical AssociationAbout 40 percent of infertile women suffer from endometriosis.—Gigi Martino, Science News
see adenomyosis
Gigi Martino, Science NewsLove words? Need even more definitions?
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