| decubitus | (noun) a reclining position (as in a bed) | - |
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| deinocheirus | (noun) lightly built medium-sized theropod with long limbs and neck | - |
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| deinonychus | (noun) swift agile wolf-sized bipedal dinosaur having a large curved claw on each hind foot; of the Cretaceous | - |
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| deleterious | (adjective) harmful to living things | Synonyms: hurtful, injurious |
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| delicious | (adjective) greatly pleasing or entertaining | Synonyms: delightful |
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| (adjective) extremely pleasing to the sense of taste | Synonyms: delectable, luscious, pleasant-tasting, scrumptious, toothsome, yummy |
| delirious | (adjective) experiencing delirium | Synonyms: hallucinating |
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| (adjective) marked by uncontrolled excitement or emotion | Synonyms: excited, frantic, mad, unrestrained |
| depilous | (adjective) completely hairless | - |
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| descensus | (noun) the slipping or falling out of place of an organ (as the uterus) | Synonyms: prolapse, prolapsus |
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| desirous | (adjective) having or expressing desire for something | Synonyms: wishful |
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| detritus | (noun) the remains of something that has been destroyed or broken up | Synonyms: debris, dust, junk, rubble |
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| (noun) loose material (stone fragments and silt etc) that is worn away from rocks | - |
| devious | (adjective) deviating from a straight course | Synonyms: circuitous, roundabout |
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| (adjective) indirect in departing from the accepted or proper way; misleading | Synonyms: oblique |
| (adjective) characterized by insincerity or deceit; evasive | Synonyms: shifty |
| dexterous | (adjective) skillful in physical movements; especially of the hands | Synonyms: deft, dextrous |
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| dextrous | (adjective) skillful in physical movements; especially of the hands | Synonyms: deft, dexterous |
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| diadromous | (adjective) (used of fish) migratory between fresh and salt waters | - |
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| diaphanous | (adjective) so thin as to transmit light | Synonyms: cobwebby, filmy, gauze-like, gauzy, gossamer, see-through, sheer, transparent, vaporous, vapourous |
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| dichotomous | (adjective) divided or dividing into two sharply distinguished parts or classifications | - |
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| diclinous | (adjective) having pistils and stamens in separate flowers | - |
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| dicotyledonous | (adjective) (of a flowering plant) having two cotyledons in the seed | - |
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| diestrous | (adjective) (of animals that have several estrous cycles in one breeding season) in a period of sexual inactivity | Synonyms: diestrual, dioestrous, dioestrual |
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| diestrus | (noun) (of animals having several estrous cycles in one breeding season) a state or interval of sexual inactivity or quiescence between periods of activity | Synonyms: diestrum |
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| dimorphous | (adjective) occurring or existing in two different forms | Synonyms: dimorphic |
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| dioecious | (adjective) having male and female reproductive organs in separate plants or animals | Synonyms: dioecian |
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| dioestrous | (adjective) (of animals that have several estrous cycles in one breeding season) in a period of sexual inactivity | Synonyms: diestrous, diestrual, dioestrual |
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| diplococcus | (noun) Gram-positive bacteria usually occurring in pairs | - |
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| diplodocus | (noun) a huge quadrupedal herbivore with long neck and tail; of late Jurassic in western North America | - |
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| dipterous | (adjective) of or relating to or belonging to the Diptera | - |
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| disadvantageous | (adjective) involving or creating circumstances detrimental to success or effectiveness | Synonyms: unfavorable, unfavourable |
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| disastrous | (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: black, calamitous, fatal, fateful |
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| discomycetous | (adjective) relating to or characteristic of fungi of the subclass Discomycetes | - |
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| discontinuous | (adjective) not continuing without interruption in time or space | Synonyms: noncontinuous |
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| (adjective) of a function or curve; possessing one or more discontinuities | - |
| discourteous | (adjective) showing no courtesy; rude | - |
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| (adjective) lacking social graces | Synonyms: ungracious |
| discus | (noun) a disk used in throwing competitions | Synonyms: saucer |
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| (noun) an athletic competition in which a disk-shaped object is thrown as far as possible | - |
| disharmonious | (adjective) lacking in harmony | Synonyms: discordant, dissonant, inharmonic |
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| disingenuous | (adjective) not straightforward or candid; giving a false appearance of frankness | Synonyms: artful |
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| disputatious | (adjective) inclined or showing an inclination to dispute or disagree, even to engage in law suits | Synonyms: combative, contentious, disputative, litigious |
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| dissentious | (adjective) dissenting (especially dissenting with the majority opinion) | Synonyms: divisive, factious |
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| dizygous | (adjective) derived from two separately fertilized eggs | Synonyms: dizygotic |
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| dolorous | (adjective) showing sorrow | Synonyms: dolourous, lachrymose, tearful, weeping |
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| dolourous | (adjective) showing sorrow | Synonyms: dolorous, lachrymose, tearful, weeping |
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| dominus | (noun) a clergyman; especially a settled minister or parson | Synonyms: domine, dominee, dominie |
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| doofus | (noun) a stupid incompetent person | Synonyms: dimwit, half-wit, nitwit |
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| drupaceous | (adjective) of or related to a drupe | - |
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| dubious | (adjective) open to doubt or suspicion | Synonyms: doubtful, dubitable, in question |
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| (adjective) fraught with uncertainty or doubt | Synonyms: doubtful |
| (adjective) not convinced | - |
| ductulus | (noun) a very small duct | Synonyms: ductule |
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| duplicitous | (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: ambidextrous, deceitful, double-dealing, double-faced, double-tongued, Janus-faced, two-faced |
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| duteous | (adjective) willingly obedient out of a sense of duty and respect | Synonyms: dutiful |
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| echinocactus | (noun) any cactus of the genus Echinocactus; strongly ribbed and very spiny; southwestern United States to Brazil | Synonyms: barrel cactus |
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| echinococcus | (noun) tapeworms whose larvae are parasitic in humans and domestic animals | - |
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| echinus | (noun) ovolo molding between the shaft and the abacus of a Doric column | - |
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| echovirus | (noun) any of a group of viruses associated with various diseases including viral meningitis and mild respiratory disorders and diarrhea in newborn infants | - |
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| edacious | (adjective) devouring or craving food in great quantities | Synonyms: esurient, rapacious, ravening, ravenous, voracious, wolfish |
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| edaphosaurus | (noun) heavy-bodied reptile with a dorsal sail or crest; of the late Paleozoic | - |
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| edematous | (adjective) swollen with an excessive accumulation of fluid | Synonyms: dropsical |
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| edentulous | (adjective) having lost teeth | - |
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| edmontosaurus | (noun) duck-billed dinosaur from Canada found as a fossilized mummy with skin | - |
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| efficacious | (adjective) marked by qualities giving the power to produce an intended effect | - |
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| (adjective) producing or capable of producing an intended result or having a striking effect | Synonyms: effective, effectual |
| egregious | (adjective) conspicuously and outrageously bad or reprehensible | Synonyms: crying, flagrant, glaring, gross, rank |
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| electrophorus | (noun) a simple electrostatic generator that generates repeated charges of static electricity | - |
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| embolus | (noun) an abnormal particle (e.g. an air bubble or part of a clot) circulating in the blood | - |
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| emeritus | (adjective) honorably retired from assigned duties and retaining your title along with the additional title `emeritus' as in `professor emeritus' | - |
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| (noun) a professor or minister who is retired from assigned duties | - |
| emphysematous | (adjective) relating to or resembling or being emphysema | - |
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| emulous | (adjective) characterized by or arising from emulation or imitation | - |
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| (adjective) eager to surpass others | Synonyms: rivalrous |
| endogamous | (adjective) pertaining to or characterized by the custom of marrying only within the limits of a clan or tribe | Synonyms: endogamic |
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| (adjective) characterized by or fit for fertilization by pollen from another flower of the same kind | Synonyms: endogamic |
| endogenous | (adjective) derived or originating internally | Synonyms: endogenic |
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| (adjective) of or resembling an endogen | - |
| endovenous | (adjective) within or by means of a vein | Synonyms: intravenous |
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| enormous | (adjective) extraordinarily large in size or extent or amount or power or degree | Synonyms: tremendous |
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| entellus | (noun) langur of southern Asia; regarded as sacred in India | Synonyms: hanuman, Presbytes entellus, Semnopithecus entellus |
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| enterovirus | (noun) any of a group of picornaviruses that infect the gastrointestinal tract and can spread to other areas (especially the nervous system) | - |
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| entomophilous | (adjective) of flowering plants (especially orchids etc) that are pollinated by insects | - |
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| envious | (adjective) showing extreme cupidity; painfully desirous of another's advantages | Synonyms: covetous, jealous |
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| eohippus | (noun) earliest horse; extinct primitive dog-sized four-toed Eocene animal | Synonyms: dawn horse |
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| epicanthus | (noun) a vertical fold of skin over the nasal canthus; typical for many east Asian peoples; sometimes occurs in Down's syndrome | Synonyms: epicanthic fold |
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| eponymous | (adjective) being or relating to or bearing the name of an eponym | Synonyms: eponymic |
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| eptatretus | (noun) a fossil hagfish of the genus Eptatretus | - |
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| equanimous | (adjective) in full control of your faculties | Synonyms: collected, poised, self-collected, self-contained, self-possessed |
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| erogenous | (adjective) sensitive to sexual stimulation | - |
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| erroneous | (adjective) containing or characterized by error | - |
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| erythematous | (adjective) relating to or characterized by erythema | - |
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| esophagus | (noun) the passage between the pharynx and the stomach | Synonyms: gorge, gullet, oesophagus |
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| estrous | (adjective) (of lower mammals) showing or in a state of estrus; in heat | - |
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| estrus | (noun) applies to nonhuman mammals: a state or period of heightened sexual arousal and activity | Synonyms: heat, oestrus, rut |
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| eucalyptus | (noun) a tree of the genus Eucalyptus | Synonyms: eucalypt, eucalyptus tree |
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| (noun) wood of any of various eucalyptus trees valued as timber | - |
| euphonious | (adjective) having a pleasant sound | Synonyms: euphonous |
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| (adjective) (of speech or dialect) pleasing in sound; not harsh or strident | - |
| euphonous | (adjective) having a pleasant sound | Synonyms: euphonious |
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| excursus | (noun) a message that departs from the main subject | Synonyms: aside, digression, divagation, parenthesis |
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| exiguous | (adjective) extremely scanty | - |
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| exodus | (noun) a journey by a large group to escape from a hostile environment | Synonyms: hegira, hejira |
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| exogamous | (adjective) pertaining to or characterized by the custom of marrying only outside the limits of a clan or tribe | Synonyms: exogamic |
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| (adjective) characterized by or fit for fertilization by a flower that is not closely related | Synonyms: exogamic |
| exogenous | (adjective) derived or originating externally | Synonyms: exogenic |
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| expeditious | (adjective) marked by speed and efficiency | - |
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| exsanguinous | (adjective) destitute of blood or apparently so | Synonyms: bloodless, exsanguine |
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| extemporaneous | (adjective) with little or no preparation or forethought | Synonyms: ad-lib, extemporary, extempore, impromptu, off-the-cuff, offhand, offhanded, unrehearsed |
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| extraneous | (adjective) not belonging to that in which it is contained; introduced from an outside source | Synonyms: foreign |
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| (adjective) not pertinent to the matter under consideration | Synonyms: immaterial, impertinent, orthogonal |
| (adjective) coming from the outside | Synonyms: external, outside |
| (adjective) not essential | - |
| fabulous | (adjective) barely credible | - |
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| (adjective) extremely pleasing | Synonyms: fab |
| (adjective) based on or told of in traditional stories; lacking factual basis or historical validity | Synonyms: mythic, mythical, mythologic, mythological |
| facetious | (adjective) cleverly amusing in tone | Synonyms: bantering, tongue-in-cheek |
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| factious | (adjective) dissenting (especially dissenting with the majority opinion) | Synonyms: dissentious, divisive |
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| factitious | (adjective) not produced by natural forces | - |
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| fallacious | (adjective) involving deception | Synonyms: deceitful, fraudulent |
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| (adjective) based on an incorrect or misleading notion or information | - |
| (adjective) containing or based on a fallacy | Synonyms: unsound |
| famous | (adjective) widely known and esteemed | Synonyms: celebrated, famed, far-famed, illustrious, notable, noted, renowned |
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| famulus | (noun) a close attendant (as to a scholar) | - |
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