| delphinium | (noun) any plant of the genus Delphinium having palmately divided leaves and showy spikes of variously colored spurred flowers; some contain extremely poisonous substances | - |
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| demographer | (noun) a scientist who studies the growth and density of populations and their vital statistics | Synonyms: demographist, population scientist |
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| demographic | (noun) a statistic characterizing human populations (or segments of human populations broken down by age or sex or income etc.) | - |
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| demographist | (noun) a scientist who studies the growth and density of populations and their vital statistics | Synonyms: demographer, population scientist |
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| demography | (noun) the branch of sociology that studies the characteristics of human populations | Synonyms: human ecology |
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| deoxyephedrine | (noun) an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant | Synonyms: chalk, chicken feed, crank, glass, ice, meth, methamphetamine, methamphetamine hydrochloride, Methedrine, shabu, trash |
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| dermatoglyphic | (noun) the lines that form patterns on the skin (especially on the fingertips and the palms of the hands and the soles of the feet) | - |
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| dermatoglyphics | (noun) the study of the whorls and loops and arches in the fingertips and on the palms of the hand and the soles of the feet | - |
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| dermatophytosis | (noun) fungal infection of the skin (especially of moist parts covered by clothing) | Synonyms: dermatomycosis |
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| diacetylmorphine | (noun) a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush | Synonyms: heroin |
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| diaglyph | (noun) glyptic art consisting of a sunken or depressed engraving or carving on a stone or gem (as opposed to cameo) | Synonyms: intaglio |
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| diaphanoscope | (noun) An instrument for illuminating the interior of a cavity to determine the translucency of its walls. | - |
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| diapheromera | (noun) a variety of stick insect | Synonyms: Diapheromera femorata |
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| diaphone | (noun) a foghorn that makes a signal consisting of two tones | - |
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| diaphoresis | (noun) the process of the sweat glands of the skin secreting a salty fluid | Synonyms: hidrosis, perspiration, sudation, sweating |
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| diaphoretic | (noun) used to produce perspiration | - |
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| diaphragm | (noun) a mechanical device in a camera that controls size of aperture of the lens | Synonyms: stop |
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| (noun) electro-acoustic transducer that vibrates to receive or produce sound waves | - |
| (noun) a contraceptive device consisting of a flexible dome-shaped cup made of rubber or plastic; it is filled with spermicide and fitted over the uterine cervix | Synonyms: contraceptive diaphragm, pessary |
| (noun) (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration | Synonyms: midriff |
| diaphysis | (noun) the main (mid) section of a long bone | Synonyms: shaft |
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| diastrophism | (noun) the process of deformation that produces continents and ocean basins in the earth's crust | - |
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| dichlorodiphenyltrichloroethane | (noun) an insecticide that is also toxic to animals and humans; banned in the United States since 1972 | Synonyms: DDT |
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| diencephalon | (noun) the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon | Synonyms: betweenbrain, interbrain, thalmencephalon |
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| digraph | (noun) two successive letters (especially two letters used to represent a single sound: `sh' in `shoe') | Synonyms: digram |
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| dihydroxyphenylalanine | (noun) amino acid that is formed in the liver and converted into dopamine in the brain | Synonyms: dopa |
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| dimorphism | (noun) (biology) the existence of two forms of individual within the same animal species (independent of sex differences) | - |
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| (noun) (chemistry) the property of certain substances that enables them to exist in two distinct crystalline forms | - |
| diphenhydramine | (noun) antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness | Synonyms: Benadryl |
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| diphenylhydantoin | (noun) an anticonvulsant drug (trade name Dilantin) used to treat epilepsy and that is not a sedative | Synonyms: Dilantin, phenytoin |
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| diphtheria | (noun) acute contagious infection caused by the bacterium Corynebacterium diphtheriae; marked by the formation of a false membrane in the throat and other air passages causing difficulty in breathing | - |
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| diphthong | (noun) a vowel sound that starts near the articulatory position for one vowel and moves toward the position for another | - |
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| discography | (noun) a descriptive catalog of musical recordings | - |
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| dolichocephalic | (noun) an adult with a long narrow head | - |
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| dolichocephalism | (noun) the quality of being dolichocephalic | Synonyms: dolichocephaly |
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| dolichocephaly | (noun) the quality of being dolichocephalic | Synonyms: dolichocephalism |
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| dolphin | (noun) any of various small toothed whales with a beaklike snout; larger than porpoises | - |
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| (noun) large slender food and game fish widely distributed in warm seas (especially around Hawaii) | Synonyms: dolphinfish, mahimahi |
| dolphinfish | (noun) large slender food and game fish widely distributed in warm seas (especially around Hawaii) | Synonyms: dolphin, mahimahi |
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| (noun) the lean flesh of a saltwater fish found in warm waters (especially in Hawaii) | Synonyms: mahimahi |
| drosophila | (noun) small fruit fly used by Thomas Hunt Morgan in studying basic mechanisms of inheritance | Synonyms: Drosophila melanogaster |
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| dysaphia | (noun) a disorder in the sense of touch | - |
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| dysgraphia | (noun) impaired ability to learn to write | - |
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| dysphagia | (noun) condition in which swallowing is difficult or painful | - |
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| dysphasia | (noun) an impairment of language (especially speech production) that is usually due to brain damage | - |
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| dysphemism | (noun) an offensive or disparaging expression that is substituted for an inoffensive one | - |
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| dysphonia | (noun) speech disorder attributable to a disorder of phonation | - |
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| dysphoria | (noun) abnormal depression and discontent | - |
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| dystrophy | (noun) any degenerative disorder resulting from inadequate or faulty nutrition | - |
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| (noun) any of several hereditary diseases of the muscular system characterized by weakness and wasting of skeletal muscles | Synonyms: muscular dystrophy |
| earphone | (noun) electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear | Synonyms: earpiece, headphone, phone |
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| echocardiograph | (noun) a sonograph that creates an image of the heart and its abnormalities | - |
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| echocardiography | (noun) a noninvasive diagnostic procedure that uses ultrasound to study to structure and motions of the heart | - |
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| echoencephalogram | (noun) a graphical image of the brain produced by an echoencephalograph | - |
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| echoencephalograph | (noun) a sonograph that creates an image of the brain and its abnormalities | - |
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| echoencephalography | (noun) a noninvasive diagnostic procedure that uses ultrasound to study the anatomy of the brain | - |
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| echograph | (noun) An instrument used to record an echogram. | - |
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| echography | (noun) using the reflections of high-frequency sound waves to construct an image of a body organ (a sonogram); commonly used to observe fetal growth or study bodily organs | Synonyms: sonography, ultrasonography, ultrasound |
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| ecphonesis | (noun) an exclamatory rhetorical device | Synonyms: exclamation |
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| ectomorph | (noun) a person with a thin body | - |
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| ectomorphy | (noun) slender, weak, and lightweight | Synonyms: asthenic type |
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| edaphosaurus | (noun) heavy-bodied reptile with a dorsal sail or crest; of the late Paleozoic | - |
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| elaphure | (noun) large Chinese deer surviving only in domesticated herds | Synonyms: Elaphurus davidianus, pere david's deer |
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| electrocardiograph | (noun) medical instrument that records electric currents associated with contractions of the heart | Synonyms: cardiograph |
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| electrocardiography | (noun) diagnostic procedure consisting of recording the activity of the heart electronically with a cardiograph (and producing a cardiogram) | Synonyms: cardiography |
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| electroencephalogram | (noun) a graphical record of electrical activity of the brain; produced by an electroencephalograph | Synonyms: EEG, encephalogram |
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| electroencephalograph | (noun) medical instrument that records electric currents generated by the brain | - |
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| electrograph | (noun) electrical device used for etching by electrolytic means | - |
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| (noun) an apparatus for the electrical transmission of pictures | - |
| electromyograph | (noun) a medical instrument that records the electrical waves associated with the activity of skeletal muscles | - |
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| electromyography | (noun) diagnosis of neuromuscular disorders with the use of an electromyograph | - |
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| electrophoresis | (noun) the motion of charged particles in a colloid under the influence of an electric field; particles with a positive charge go to the cathode and negative to the anode | Synonyms: cataphoresis, dielectrolysis, ionophoresis |
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| electrophorus | (noun) a simple electrostatic generator that generates repeated charges of static electricity | - |
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| elephant | (noun) five-toed pachyderm | - |
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| (noun) the symbol of the Republican Party; introduced in cartoons by Thomas Nast in 1874 | - |
| elephantiasis | (noun) hypertrophy of certain body parts (usually legs and scrotum); the end state of the disease filariasis | - |
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| emphasis | (noun) intensity or forcefulness of expression | Synonyms: vehemence |
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| (noun) the relative prominence of a syllable or musical note (especially with regard to stress or pitch) | Synonyms: accent, stress |
| (noun) special and significant stress by means of position or repetition e.g. | - |
| (noun) special importance or significance | Synonyms: accent |
| emphasizing | (noun) the act of giving special importance or significance to something | Synonyms: accenting, accentuation |
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| emphysema | (noun) an abnormal condition of the lungs marked by decreased respiratory function; associated with smoking or chronic bronchitis or old age | Synonyms: pulmonary emphysema |
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| enantiomorph | (noun) either one of a pair of compounds (crystals or molecules) that are mirror images on each other but are not identical | Synonyms: enantiomer |
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| enantiomorphism | (noun) the relation of opposition between crystals or molecules that are reflections of one another | Synonyms: mirror-image relation |
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| encephalartos | (noun) any of numerous cycads of the genus Encephalartos having stout cylindrical trunks and a terminal crown of long often spiny pinnate leaves | - |
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| encephalitis | (noun) inflammation of the brain usually caused by a virus; symptoms include headache and neck pain and drowsiness and nausea and fever (`phrenitis' is no longer in scientific use) | Synonyms: cephalitis, phrenitis |
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| encephalocele | (noun) protrusion of brain tissue through a congenital fissure in the skull | - |
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| encephalogram | (noun) an X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast | Synonyms: pneumoencephalogram |
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| (noun) a graphical record of electrical activity of the brain; produced by an electroencephalograph | Synonyms: EEG, electroencephalogram |
| encephalograph | (noun) Any apparatus used to produce an encephalogram by recording electric currents generated by the brain. | - |
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| encephalography | (noun) roentgenography of the brain after spinal fluid has been replaced by a gas (usually oxygen); produces an encephalogram | - |
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| encephalomeningitis | (noun) inflammation of the brain and spinal cord and their meninges | Synonyms: cerebromeningitis, meningoencephalitis |
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| encephalomyelitis | (noun) inflammation of the brain and spinal cord | - |
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| encephalon | (noun) that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord | Synonyms: brain |
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| encephalopathy | (noun) any disorder or disease of the brain | Synonyms: brain disease, brain disorder |
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| endolymph | (noun) the bodily fluid that fills the membranous labyrinth of the inner ear | - |
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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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| endorphin | (noun) a neurochemical occurring naturally in the brain and having analgesic properties | - |
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| enkephalin | (noun) an endorphin having opiate qualities that occurs in the brain and spinal cord and elsewhere | - |
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| enophile | (noun) someone who appreciates wine | Synonyms: oenophile |
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| entomophobia | (noun) a morbid fear of insects | - |
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| entryphone | (noun) An intercom system which enables someone, without opening the door, to converse with the person who has rung the doorbell. | - |
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| eosinophil | (noun) a leukocyte readily stained with eosin | Synonyms: eosinophile |
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| eosinophile | (noun) a leukocyte readily stained with eosin | Synonyms: eosinophil |
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| eosinophilia | (noun) a symptom of allergic states; increased eosinophils in the blood | - |
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| epanaphora | (noun) repetition of a word or phrase at the beginning of successive clauses | Synonyms: anaphora |
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| epha | (noun) an ancient Hebrew unit of dry measure equal to about a bushel | Synonyms: ephah |
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| ephah | (noun) an ancient Hebrew unit of dry measure equal to about a bushel | Synonyms: epha |
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| ephebeia | (noun) in ancient Greece, a state institution organized to train freeborn youths between the ages of 18 and 20 for military and administrative service. | - |
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| ephedra | (noun) jointed and nearly leafless desert shrub having reduced scalelike leaves and reddish fleshy seeds | Synonyms: joint fir |
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| ephedrine | (noun) white odorless powdered or crystalline alkaloid from plants of the genus Ephedra (especially Ephedra sinica) or made synthetically; used as a bronchodilator to treat bronchitis and asthma | - |
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| ephemera | (noun) something transitory; lasting a day | - |
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