noun, plural endometria [en-doh-mee-tree-uh] . Anatomy.
the mucous membrane lining the uterus.

1880–85; endo- + Neo-Latin -metrium < Greek mḗtr(ā) womb + -ion diminutive suffix

endometrial, adjective
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World English Dictionary
endometrium (ˌɛndəʊˈmiːtrɪəm)
n , pl -tria
the mucous membrane that lines the uterus
[C19: New Latin, from endo- + Greek mētra uterus]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1882, from endo- + Gk. metra uterus, related to meter (see mother).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

endometrium en·do·me·tri·um (ěn'dō-mē'trē-əm)
n. pl. en·do·me·tri·a (-trē-ə)
The glandular mucous membrane comprising the inner layer of the uterine wall.

en'do·me'tri·al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
endometrium   (ěn'dō-mē'trē-əm)  Pronunciation Key 
Plural endometria
The mucous membrane that lines the uterus. A fertilized egg must embed itself in the endometrium in order to develop into an embryo. See more at menstrual cycle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Endometrial implants vary widely in size, shape, and color.
Studies have shown that all those methods reduce the risk of ovarian and
  endometrial cancer.
They also protect against ovarian and endometrial cancers.
Progestins may also be used alone, since they have specific effects that can
  cause the endometrial tissue to atrophy.
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