| endoblast | (noun) the inner germ layer that develops into the lining of the digestive and respiratory systems | Synonyms: endoderm, entoblast, entoderm, hypoblast |
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| endocarditis | (noun) inflammation of the endocardium and heart valves | - |
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| endocardium | (noun) the membrane that lines the cavities of the heart and forms part of the heart valves | - |
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| endocarp | (noun) the hard inner (usually woody) layer of the pericarp of some fruits (as peaches or plums or cherries or olives) that contains the seed | Synonyms: pit, stone |
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| endocervicitis | (noun) inflammation of the mucous lining of the uterine cervix | - |
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| endocranium | (noun) membrane lining the inside of the skull | - |
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| endocrine | (noun) the secretion of an endocrine gland that is transmitted by the blood to the tissue on which it has a specific effect | Synonyms: hormone, internal secretion |
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| (noun) any of the glands of the endocrine system that secrete hormones directly into the bloodstream | Synonyms: ductless gland, endocrine gland |
| endocrinologist | (noun) physician who specializes in the diagnosis and treatment of conditions affecting the endocrine system | - |
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| endocrinology | (noun) the branch of medicine dealing with the endocrine glands and their secretions | - |
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| endoderm | (noun) the inner germ layer that develops into the lining of the digestive and respiratory systems | Synonyms: endoblast, entoblast, entoderm, hypoblast |
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| endodontia | (noun) the branch of dentistry dealing with diseases of the dental pulp | Synonyms: endodontics |
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| endodontics | (noun) the branch of dentistry dealing with diseases of the dental pulp | Synonyms: endodontia |
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| endodontist | (noun) a dentist specializing in diseases of the dental pulp and nerve | - |
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| endogamy | (noun) marriage within one's own tribe or group as required by custom or law | Synonyms: inmarriage, intermarriage |
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| endogen | (noun) a monocotyledonous flowering plant; the stem grows by deposits on its inside | Synonyms: liliopsid, monocot, monocotyledon |
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| endogeny | (noun) a geological phenomenon below the surface of the earth | - |
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| endolymph | (noun) the bodily fluid that fills the membranous labyrinth of the inner ear | - |
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| endometriosis | (noun) the presence of endometrium elsewhere than in the lining of the uterus; causes premenstrual pain and dysmenorrhea | Synonyms: adenomyosis |
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| endometritis | (noun) inflammation of the lining of the uterus (of the endometrium) | Synonyms: metritis |
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| endometrium | (noun) (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 | - |
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| endomorph | (noun) a heavy person with a soft and rounded body | - |
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| endomorphy | (noun) round, fat, and heavy | Synonyms: pyknic type |
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| endoneurium | (noun) delicate connective tissue around individual nerve fibers in nerve | - |
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| endonuclease | (noun) a nuclease that cleaves nucleic acids at interior bonds and so produces fragments of various sizes | - |
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| endoparasite | (noun) any of various parasites that live in the internal organs of animals (especially intestinal worms) | Synonyms: endozoan, entoparasite, entozoan, entozoon |
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| endoplasm | (noun) the inner portion of the cytoplasm of a cell | - |
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| endopsammon | (noun) The microscopic fauna of sand and mud. | - |
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| endorphin | (noun) a neurochemical occurring naturally in the brain and having analgesic properties | - |
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| endorsement | (noun) the act of endorsing | Synonyms: indorsement |
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| (noun) formal and explicit approval | Synonyms: countenance, imprimatur, indorsement, sanction, warrant |
| (noun) a promotional statement (as found on the dust jackets of books) | Synonyms: blurb, indorsement |
| (noun) a speech seconding a motion | Synonyms: indorsement, second, secondment |
| (noun) a signature that validates something | Synonyms: indorsement |
| endorser | (noun) someone who expresses strong approval | Synonyms: indorser, ratifier, subscriber |
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| (noun) a person who transfers his ownership interest in something by signing a check or negotiable security | Synonyms: indorser |
| endoscope | (noun) a long slender medical instrument for examining the interior of a bodily organ or performing minor surgery | - |
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| endoscopy | (noun) visual examination of the interior of a hollow body organ by use of an endoscope | - |
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| endoskeleton | (noun) the internal skeleton; bony and cartilaginous structure (especially of vertebrates) | - |
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| endosperm | (noun) nutritive tissue surrounding the embryo within seeds of flowering plants | - |
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| endospore | (noun) a small asexual spore that develops inside the cell of some bacteria and algae | - |
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| endosteum | (noun) vascular membrane that lines the inner surface of long bones | - |
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| endothelium | (noun) an epithelium of mesoblastic origin; a thin layer of flattened cells that lines the inside of some body cavities | - |
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| endotoxin | (noun) a toxin that is confined inside the microorganisms and is released only when the microorganisms are broken down or die | - |
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| endowment | (noun) the act of endowing with a permanent source of income | - |
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| (noun) natural abilities or qualities | Synonyms: gift, natural endowment, talent |
| (noun) the capital that provides income for an institution | Synonyms: endowment fund |
| endozoan | (noun) any of various parasites that live in the internal organs of animals (especially intestinal worms) | Synonyms: endoparasite, entoparasite, entozoan, entozoon |
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