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endometriosis the abnormal growth of uterine tissue in other areas of the vaginal tract or on the ovaries.
endometrium the membrane that lines the uterus.
endomorphic of, relating to, or designating a heavy body type characterized by relative prominence of the abdomen and fatty tissues. (Cf. ectomorphic, mesomorphic.) [2 definitions]
endoplasm the inner, comparatively fluid part of the cellular material surrounding the nucleus. (Cf. ectoplasm.)
end organ any specialized receptor at the end of a sensory or motor nerve fiber.
endorphin one of several peptides secreted in the brain that have a tranquilizing, euphoric, or pain-relieving effect on the body.
endorse to approve or give support to. [2 definitions]
endorsement a statement given in support of a person or product, as in an advertisement or political campaign. [3 definitions]
endoskeleton the internal bony supporting framework characteristic of vertebrates. (Cf. exoskeleton.)
endosperm tissue that is derived from the embryo sac of a plant and that surrounds and nourishes the embryo.
endue to endow with some quality or characteristic.
endurable able to be endured or withstood.