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endocrinology the science of the structure, functions, and secretions of endocrine glands.
endoderm the inner layer of cells of an embryo, which develops into the linings of the digestive tract, certain glands, and other internal organs.
endodontics (used with a sing. verb) the branch of dentistry that diagnoses and treats diseases of the dental pulp; root canal therapy.
endogamy marriage within one's own class, clan, caste, tribe, or other social unit. (Cf. exogamy.) [2 definitions]
endogenous coming or produced from or developing within, as certain spores, or due to internal conditions, as certain diseases. (Cf. exogenous.) [2 definitions]
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.
endothermic of, concerning, or characteristic of a chemical process accompanied or caused by absorption of heat. (Cf. exothermic.)
endow to give a permanent income, source of income, or property to. [2 definitions]
endowment the act of providing with a permanent fund or source of income, or the money so provided. [2 definitions]
endowment policy a type of insurance policy in which the insured receives a certain amount of money upon the policy's expiration, or the beneficiaries receive the money if the insured dies before the specified time.
end product the final or finished product, as of an industry, chemical reaction, or growth process.
end table a small table, usu. rectangular, placed at either end of a sofa or beside a chair.