| endameba | (noun) any ameba of the genus Endamoeba | - |
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| endodontia | (noun) the branch of dentistry dealing with diseases of the dental pulp | Synonyms: endodontics |
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| enema | (noun) an injection of a liquid through the anus to stimulate evacuation; sometimes used for diagnostic purposes | Synonyms: clyster |
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| engelmannia | (noun) common erect hairy perennial of plains and prairies of southern and central United States having flowers that resemble sunflowers | - |
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| enigma | (noun) something that baffles understanding and cannot be explained | Synonyms: closed book, mystery, secret |
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| (noun) a difficult problem | Synonyms: brain-teaser, conundrum, riddle |
| enterobacteria | (noun) rod-shaped Gram-negative bacteria; most occur normally or pathogenically in intestines of humans and other animals | Synonyms: enteric bacteria, enterics, entric |
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| enterotoxemia | (noun) a disease of cattle and sheep that is attributed to toxins absorbed from the intestines | - |
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| entomophobia | (noun) a morbid fear of insects | - |
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| eosinopenia | (noun) a decrease in the number of eosinophils in the blood | - |
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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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| ependyma | (noun) thin epithelial membrane lining the ventricles of the brain and the spinal cord canal | - |
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| epha | (noun) an ancient Hebrew unit of dry measure equal to about a bushel | Synonyms: ephah |
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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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| ephemera | (noun) something transitory; lasting a day | - |
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| epicardia | (noun) the short part of the esophagus extending downward from the diaphragm to the stomach | - |
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| epicheirema | (noun) a syllogism in which some statement supporting one or both of the premises is introduced with the premises themselves. | - |
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| epikeratophakia | (noun) using a piece of donated corneal tissue to repair the eye of someone who has had a cataract removed | - |
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| epiphonema | (noun) a sentence that is an exclamation, a general or striking comment, or a succinct summary of what has previously been said. | - |
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| epiphora | (noun) repetition of the ends of two or more successive sentences, verses, etc. | Synonyms: epistrophe |
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| episcia | (noun) any plant of the genus Episcia; usually creeping and stoloniferous and of cascading habit; grown for their colorful foliage and flowers | - |
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| epithelioma | (noun) a malignant tumor of the epithelial tissue | - |
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| era | (noun) a period marked by distinctive character or reckoned from a fixed point or event | Synonyms: epoch |
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| (noun) a major division of geological time; an era is usually divided into two or more periods | Synonyms: geological era |
| erica | (noun) any plant of the genus Erica | Synonyms: true heath |
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| erotica | (noun) creative activity (writing or pictures or films etc.) of no literary or artistic value other than to stimulate sexual desire | Synonyms: porn, porno, pornography, smut |
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| erwinia | (noun) rod-shaped motile bacteria that attack plants | - |
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| erythema | (noun) abnormal redness of the skin resulting from dilation of blood vessels (as in sunburn or inflammation) | - |
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| erythrina | (noun) any of various shrubs or shrubby trees of the genus Erythrina having trifoliate leaves and racemes of scarlet to coral red flowers and black seeds; cultivated as an ornamental | Synonyms: coral tree |
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| erythroderma | (noun) any skin disorder involving abnormal redness | - |
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| escherichia | (noun) a genus of enteric bacteria | - |
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| esoterica | (noun) secrets known only to an initiated minority | - |
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| esotropia | (noun) strabismus in which one or both eyes turn inward toward the nose | Synonyms: convergent strabismus, cross-eye, crossed eye |
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| esthesia | (noun) mental responsiveness and awareness | Synonyms: aesthesia, sensibility |
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| eta | (noun) the 7th letter of the Greek alphabet | - |
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| etcetera | (noun) additional unspecified odds and ends; more of the same; entity, other pronoun; pronoun, entity; quantifier: other | - |
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| (adverb) continuing in the same way | Synonyms: and so forth, and so on, etc. |
| etna | (noun) a gas burner used in laboratories; has an air valve to regulate the mixture of gas and air | Synonyms: bunsen, bunsen burner |
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| eubacteria | (noun) a large group of bacteria having rigid cell walls; motile types have flagella | Synonyms: eubacterium, true bacteria |
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| eudaemonia | (noun) a contented state of being happy and healthy and prosperous | Synonyms: eudaimonia, upbeat, welfare, well-being, wellbeing |
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| eudaimonia | (noun) a contented state of being happy and healthy and prosperous | Synonyms: eudaemonia, upbeat, welfare, well-being, wellbeing |
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| euglena | (noun) minute single-celled green freshwater organism having a single flagella; often classed as algae | - |
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| euphoria | (noun) a feeling of great (usually exaggerated) elation | Synonyms: euphory |
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| eupnea | (noun) normal relaxed breathing | Synonyms: eupnoea |
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| eupnoea | (noun) normal relaxed breathing | Synonyms: eupnea |
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| europhilia | (noun) admiration for Europe, Europeans, or the European Union. | - |
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| euthanasia | (noun) the act of killing someone painlessly (especially someone suffering from an incurable illness) | Synonyms: mercy killing |
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| exacta | (noun) a bet that you can pick the first and second finishers in the right order | Synonyms: perfecta |
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| exanthema | (noun) eruption on the skin occurring as a symptom of a disease | Synonyms: exanthem, skin eruption |
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| excreta | (noun) waste matter (as urine or sweat but especially feces) discharged from the body | Synonyms: body waste, excrement, excretion, excretory product |
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| exodontia | (noun) the branch of dentistry dealing with extraction of teeth | Synonyms: exodontics |
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| exotropia | (noun) strabismus in which one or both eyes are directed outward | Synonyms: divergent strabismus, walleye |
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| extra | (adjective) further or added | Synonyms: additional |
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| (adjective) more than is needed, desired, or required | Synonyms: excess, redundant, spare, supererogatory, superfluous, supernumerary, surplus |
| (adjective) added to a regular schedule | Synonyms: special |
| (noun) something additional of the same kind | Synonyms: duplicate |
| (noun) an additional edition of a newspaper (usually to report a crisis) | - |
| (noun) a minor actor in crowd scenes | Synonyms: spear carrier, supernumerary |
| (adverb) unusually or exceptionally | - |
| extravaganza | (noun) any lavishly staged or spectacular entertainment | - |
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| exurbia | (noun) a residential area outside of a city and beyond suburbia | - |
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| eyra | (noun) long-bodied long-tailed tropical American wildcat | Synonyms: Felis yagouaroundi, jaguarondi, jaguarundi, jaguarundi cat |
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| fa | (noun) the syllable naming the fourth (subdominant) note of the diatonic scale in solmization | - |
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| facia | (noun) a sheet or band of fibrous connective tissue separating or binding together muscles and organs etc | Synonyms: fascia |
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| facula | (noun) a large bright spot on the sun's photosphere occurring most frequently in the vicinity of sunspots | Synonyms: solar facula |
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| (noun) a bright spot on a planet | - |
| falanga | (noun) a form of torture in which the soles of the feet are beaten with whips or cudgels | Synonyms: bastinado |
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| fanaloka | (noun) civet of Madagascar | Synonyms: Fossa fossa |
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| fantasia | (noun) a musical composition of a free form usually incorporating several familiar themes | - |
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| farina | (noun) fine meal made from cereal grain especially wheat; often used as a cooked cereal or in puddings | - |
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| fascia | (noun) instrument panel on an automobile or airplane containing dials and controls | Synonyms: dashboard |
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| (noun) a sheet or band of fibrous connective tissue separating or binding together muscles and organs etc | Synonyms: facia |
| fascista | (noun) an Italian fascist under Mussolini | - |
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| fatwa | (noun) a ruling on a point of Islamic law that is given by a recognized authority | - |
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| fauna | (noun) a living organism characterized by voluntary movement | Synonyms: animal, animate being, beast, brute, creature |
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| (noun) all the animal life in a particular region or period | Synonyms: zoology |
| fecula | (noun) excreta (especially of insects) | - |
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| federita | (noun) a Sudanese sorghum having exceptionally large soft white grains | Synonyms: feterita, Sorghum vulgare caudatum |
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| fedora | (noun) a hat made of felt with a creased crown | Synonyms: felt hat, homburg, Stetson, trilby |
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| feijoa | (noun) dark-green kiwi-sized tropical fruit with white flesh; used chiefly for jellies and preserves | Synonyms: pineapple guava |
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| (noun) South American shrub having edible greenish plumlike fruit | Synonyms: feijoa bush |
| fella | (noun) a boy or man | Synonyms: blighter, bloke, chap, cuss, feller, fellow, gent, lad |
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| felucca | (noun) a fast narrow sailing ship of the Mediterranean | - |
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| fenestella | (noun) oval or circular opening; to allow light into a dome or vault | Synonyms: lunette |
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| fenestra | (noun) a small opening covered with membrane (especially one in the bone between the middle and inner ear) | - |
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| feria | (noun) (in Spanish speaking regions) a local festival or fair, usually in honor of some patron saint | - |
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| (noun) a weekday on which no festival or holiday is celebrated | - |
| fermata | (noun) (music) a prolongation of unspecified length on a note or chord or rest | - |
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| (noun) a musical notation (over a note or chord or rest) that indicates it is to be prolonged by an unspecified amount | - |
| feterita | (noun) a Sudanese sorghum having exceptionally large soft white grains | Synonyms: federita, Sorghum vulgare caudatum |
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| fibroadenoma | (noun) benign and movable and firm and not tender tumor of the breast; common in young women and caused by high levels of estrogen | - |
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| fibroma | (noun) nonmalignant tumor of connective tissue | - |
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| fibula | (noun) the outer and thinner of the two bones of the human leg between the knee and ankle | Synonyms: calf bone |
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| fiesta | (noun) an elaborate party (often outdoors) | Synonyms: feast, fete |
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| filaria | (noun) slender threadlike roundworms living in the blood and tissues of vertebrates; transmitted as larvae by biting insects | - |
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| (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfilaria, alfileria, clocks, Erodium cicutarium, filaree, pin clover, pin grass, redstem storksbill |
| fimbria | (noun) thin projections forming a fringe (especially around the ovarian end of the Fallopian tube) | - |
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| fistula | (noun) an abnormal passage leading from a suppurating cavity to the body surface | Synonyms: sinus |
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| (noun) a chronic inflammation of the withers of a horse | Synonyms: fistulous withers |
| flea | (noun) any wingless bloodsucking parasitic insect noted for ability to leap | - |
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| flindosa | (noun) tall Australian timber tree yielding tough hard wood used for staves etc | Synonyms: Flindersia australis, flindosy, native beech |
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| flora | (noun) (botany) a living organism lacking the power of locomotion | Synonyms: plant, plant life |
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| (noun) all the plant life in a particular region or period | Synonyms: botany, vegetation |
| flotilla | (noun) a fleet of small craft | - |
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| (noun) a United States Navy fleet consisting of two or more squadrons of small warships | - |
| forestiera | (noun) any plant of the genus Forestiera | - |
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| formula | (noun) something regarded as a normative example | Synonyms: convention, normal, pattern, rule |
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| (noun) (mathematics) a standard procedure for solving a class of mathematical problems | Synonyms: rule |
| (noun) a group of symbols that make a mathematical statement | Synonyms: expression |
| (noun) a conventionalized statement expressing some fundamental principle | - |
| (noun) directions for making something | Synonyms: recipe |
| (noun) a representation of a substance using symbols for its constituent elements | Synonyms: chemical formula |
| (noun) a liquid food for infants | - |
| forsythia | (noun) any of various early blooming oleaceous shrubs of the genus Forsythia; native to eastern Asia and southern Europe but widely cultivated for their branches of bright yellow bell-shaped flowers | - |
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| fossa | (noun) largest carnivore of Madagascar; intermediate in some respects between cats and civets | Synonyms: Cryptoprocta ferox, fossa cat |
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| (noun) a concavity in a surface (especially an anatomical depression) | Synonyms: pit |
| fothergilla | (noun) any of several deciduous low-growing shrubs of the genus Fothergilla having showy brushlike spikes of white flowers in spring and fiery red and orange autumn color; grows from Alabama to the Allegheny Mountains | Synonyms: witch alder |
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| fovea | (noun) area consisting of a small depression in the retina containing cones and where vision is most acute | Synonyms: fovea centralis |
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| frambesia | (noun) an infectious tropical disease resembling syphilis in its early stages; marked by red skin eruptions and ulcerating lesions | Synonyms: framboesia, yaws |
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| framboesia | (noun) an infectious tropical disease resembling syphilis in its early stages; marked by red skin eruptions and ulcerating lesions | Synonyms: frambesia, yaws |
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| fraxinella | (noun) Eurasian perennial herb with white flowers that emit flammable vapor in hot weather | Synonyms: burning bush, Dictamnus alba, dittany, gas plant |
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| freesia | (noun) any of several plants of the genus Freesia valued for their one-sided clusters of usually fragrant yellow or white or pink tubular flowers | - |
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| frittata | (noun) Italian omelet with diced vegetables and meats; cooked until bottom is set then inverted into another pan to cook the top | - |
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| fructosuria | (noun) the presence of levulose is the urine | - |
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