Endometrium

from WordNet (r) 3.0 (2006)

endometrium
    n 1: (pregnancy) the mucous membrane that lines the uterus;
         thickens under hormonal control and (if pregnancy does not
         occur) is shed in menstruation; if pregnancy occurs it is
         shed along with the placenta at parturition

from The Collaborative International Dictionary of English v.0.48

Endometrium \En`do*me"tri*um\, n. [NL., fr. Gr. 'e`ndon within +
   mh`tra the womb.] (Anat.)
   The membrane lining the inner surface of the uterus, or womb.
   [1913 Webster]

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