| extermination | (noun) the act of exterminating | Synonyms: liquidation |
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| (noun) complete annihilation | Synonyms: extinction |
| exterminator | (noun) someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects) | Synonyms: eradicator, terminator |
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| extern | (noun) a nonresident doctor or medical student; connected with a hospital but not living there | Synonyms: medical extern |
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| external | (noun) outward features | - |
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| externalisation | (noun) embodying in an outward form | Synonyms: exteriorisation, exteriorization, externalization |
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| (noun) attributing to outside causes | Synonyms: externalization |
| externality | (noun) the quality or state of being outside or directed toward or relating to the outside or exterior | Synonyms: outwardness |
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| externalization | (noun) embodying in an outward form | Synonyms: exteriorisation, exteriorization, externalisation |
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| (noun) attributing to outside causes | Synonyms: externalisation |
| exteroception | (noun) sensitivity to stimuli originating outside of the body | - |
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| exteroceptor | (noun) any receptor that responds to stimuli outside the body | - |
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| extinction | (noun) the act of extinguishing; causing to stop burning | Synonyms: extinguishing, quenching |
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| (noun) a conditioning process in which the reinforcer is removed and a conditioned response becomes independent of the conditioned stimulus | Synonyms: experimental extinction |
| (noun) complete annihilation | Synonyms: extermination |
| (noun) the reduction of the intensity of radiation as a consequence of absorption and radiation | - |
| (noun) no longer in existence | Synonyms: defunctness |
| (noun) no longer active; extinguished | - |
| extinguisher | (noun) a manually operated device for extinguishing small fires | Synonyms: asphyxiator, fire extinguisher |
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| extinguishing | (noun) the act of extinguishing; causing to stop burning | Synonyms: extinction, quenching |
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| extirpation | (noun) surgical removal of a body part or tissue | Synonyms: ablation, cutting out, excision |
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| (noun) the act of pulling up or out; uprooting; cutting off from existence | Synonyms: deracination, excision |
| extirpator | (noun) a farm implement used to remove weeds. | - |
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| extoller | (noun) someone who communicates high praise | Synonyms: laudator, lauder |
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| extolment | (noun) an expression of approval and commendation | Synonyms: congratulations, kudos, praise |
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| extortion | (noun) the felonious act of extorting money (as by threats of violence) | - |
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| (noun) unjust exaction (as by the misuse of authority) | - |
| (noun) an exorbitant charge | - |
| extortioner | (noun) a criminal who extorts money from someone by threatening to expose embarrassing information about them | Synonyms: blackmailer, extortionist |
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| extortionist | (noun) a criminal who extorts money from someone by threatening to expose embarrassing information about them | Synonyms: blackmailer, extortioner |
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| extra | (noun) something additional of the same kind | Synonyms: duplicate |
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| (noun) an additional edition of a newspaper (usually to report a crisis) | - |
| (noun) a minor actor in crowd scenes | Synonyms: spear carrier, supernumerary |
| extract | (noun) a passage selected from a larger work | Synonyms: excerpt, excerption, selection |
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| (noun) a solution obtained by steeping or soaking a substance (usually in water) | Synonyms: infusion |
| extractant | (noun) an immiscible liquid used to extract a substance from another liquid. | - |
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| extraction | (noun) the action of taking out something (especially using effort or force) | - |
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| (noun) properties attributable to your ancestry | Synonyms: descent, origin |
| (noun) the process of obtaining something from a mixture or compound by chemical or physical or mechanical means | - |
| extractivity | (noun) the amount of extract that grains of malt yield. | - |
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| extractor | (noun) an instrument for extracting tight-fitting components | - |
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| (noun) an apparatus that uses centrifugal force to separate particles from a suspension | Synonyms: centrifuge, separator |
| (noun) a mechanism in a firearm that pulls an empty shell case out of the chamber and passes it to the ejector | Synonyms: cartridge extractor, cartridge remover |
| extradition | (noun) the surrender of an accused or convicted person by one state or country to another (usually under the provisions of a statute or treaty) | - |
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| extrados | (noun) the exterior curve of an arch | - |
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| extraneity | (noun) The state of not forming an essential or vital part. | Synonyms: extraneousness |
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| extraneousness | (noun) The state of not forming an essential or vital part. | Synonyms: extraneity |
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| (noun) unrelatedness by virtue of falling outside the matter at hand | - |
| extraordinariness | (noun) the quality of being extraordinary and not commonly encountered | - |
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| extrapolation | (noun) (mathematics) calculation of the value of a function outside the range of known values | - |
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| (noun) an inference about the future (or about some hypothetical situation) based on known facts and observations | - |
| extrasystole | (noun) a premature systole resulting in a momentary cardiac arrhythmia | - |
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| extraterrestrial | (noun) a form of life assumed to exist outside the Earth or its atmosphere | Synonyms: alien, extraterrestrial being |
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| extravagance | (noun) the activity of excessive spending | Synonyms: high life, highlife, lavishness, prodigality |
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| (noun) the trait of spending extravagantly | Synonyms: prodigality, profligacy |
| (noun) the quality of exceeding the appropriate limits of decorum or probability or truth | Synonyms: extravagancy |
| extravagancy | (noun) the quality of exceeding the appropriate limits of decorum or probability or truth | Synonyms: extravagance |
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| extravaganza | (noun) any lavishly staged or spectacular entertainment | - |
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| extravasation | (noun) the process of exuding or passing out of a vessel into surrounding tissues; said of blood or lymph or urine | - |
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| (noun) (of volcanoes) pouring out fumes or lava (or a deposit so formed) | Synonyms: eructation, eruption |
| (noun) an extravasated liquid (blood or lymph or urine); the product of extravasation | - |
| extraversion | (noun) (psychology) an extroverted disposition; concern with what is outside the self | Synonyms: extroversion |
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| extravert | (noun) (psychology) a person concerned more with practical realities than with inner thoughts and feelings | Synonyms: extrovert |
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| extreme | (noun) the furthest or highest degree of something | - |
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| (noun) the point located farthest from the middle of something | Synonyms: extreme point, extremum |
| extremeness | (noun) the quality of being extreme | - |
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| extremism | (noun) any political theory favoring immoderate uncompromising policies | - |
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| extremist | (noun) a person who holds extreme views | - |
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| extremity | (noun) an external body part that projects from the body | Synonyms: appendage, member |
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| (noun) that part of a limb that is farthest from the torso | - |
| (noun) the outermost or farthest region or point | - |
| (noun) the greatest or utmost degree | - |
| (noun) an extreme condition or state (especially of adversity or disease) | - |
| extremum | (noun) the point located farthest from the middle of something | Synonyms: extreme, extreme point |
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| (noun) the most extreme possible amount or value | Synonyms: peak |
| extrication | (noun) the act of releasing from a snarled or tangled condition | Synonyms: disentanglement, unsnarling, untangling |
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| extropy | (noun) the prediction that human intelligence and technology will enable life to expand in an orderly way throughout the entire universe | - |
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| extrospection | (noun) examination or observation of what is outside oneself, as opposed to introspection. | - |
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| extroversion | (noun) (psychology) an extroverted disposition; concern with what is outside the self | Synonyms: extraversion |
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| extrovert | (noun) (psychology) a person concerned more with practical realities than with inner thoughts and feelings | Synonyms: extravert |
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| extrusion | (noun) squeezing out by applying pressure | Synonyms: expulsion |
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| (noun) something that bulges out or is protuberant or projects from its surroundings | Synonyms: bulge, bump, excrescence, gibbosity, gibbousness, hump, jut, prominence, protrusion, protuberance, swelling |
| exuberance | (noun) overflowing with eager enjoyment or approval | Synonyms: ebullience, enthusiasm |
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| (noun) joyful enthusiasm | - |
| exudate | (noun) a substance that oozes out from plant pores | Synonyms: exudation |
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| exudation | (noun) the process of exuding; the slow escape of liquids from blood vessels through pores or breaks in the cell membranes | Synonyms: transudation |
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| (noun) a substance that oozes out from plant pores | Synonyms: exudate |
| exultation | (noun) the utterance of sounds expressing great joy | Synonyms: jubilation, rejoicing |
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| (noun) a feeling of extreme joy | Synonyms: jubilance, jubilancy, jubilation |
| exurbia | (noun) a residential area outside of a city and beyond suburbia | - |
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| exuviae | (noun) cast-off skins or coverings of various organisms during ecdysis | - |
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| flex | (noun) the act of flexing | - |
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| flexibility | (noun) the quality of being adaptable or variable | Synonyms: flexibleness |
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| (noun) the property of being flexible; easily bent or shaped | Synonyms: flexibleness |
| (noun) the trait of being easily persuaded | Synonyms: tractability, tractableness |
| flexibleness | (noun) the property of being flexible; easily bent or shaped | Synonyms: flexibility |
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| (noun) the quality of being adaptable or variable | Synonyms: flexibility |
| flexion | (noun) act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased | Synonyms: flexure |
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| (noun) deviation from a straight or normal course | Synonyms: flection, inflection |
| (noun) the state of being flexed (as of a joint) | Synonyms: flection, flexure |
| flexitarianism | (noun) The practice of eating mainly vegetarian food, but making occasional exceptions for social, pragmatic, cultural, or nutritional reasons. | Synonyms: semi-vegetarianism |
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| flexor | (noun) a skeletal muscle whose contraction bends a joint | Synonyms: flexor muscle |
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| flexure | (noun) act of bending a joint; especially a joint between the bones of a limb so that the angle between them is decreased | Synonyms: flexion |
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| (noun) an angular or rounded shape made by folding | Synonyms: bend, crease, crimp, fold, plication |
| (noun) the state of being flexed (as of a joint) | Synonyms: flection, flexion |
| genuflexion | (noun) the act of bending the knees in worship or reverence | Synonyms: genuflection |
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| googolplex | (noun) a cardinal number represented as 1 followed by a googol of zeros (ten raised to the power of a googol) | - |
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| heterosexism | (noun) discrimination in favor of heterosexual and against homosexual people | - |
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| heterosexual | (noun) a person having a sexual orientation to persons of the opposite sex | Synonyms: heterosexual person, straight, straight person |
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| heterosexualism | (noun) a sexual attraction to (or sexual relations with) persons of the opposite sex | Synonyms: heterosexuality, straightness |
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| heterosexuality | (noun) a sexual attraction to (or sexual relations with) persons of the opposite sex | Synonyms: heterosexualism, straightness |
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| hex | (noun) an evil spell | Synonyms: curse, jinx, whammy |
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| hexachlorophene | (noun) antibacterial substance that is a water-soluble powder used in antiseptic soaps and toothpaste | - |
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| hexad | (noun) the cardinal number that is the sum of five and one | Synonyms: 6, Captain Hicks, half a dozen, sestet, sextet, sextuplet, sise, six, sixer, VI |
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| hexagon | (noun) a six-sided polygon | - |
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| hexagram | (noun) a regular polygon formed by extending each of the sides of a regular hexagon to form two equilateral triangles | - |
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| hexahedron | (noun) any polyhedron having six plane faces | - |
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| hexakosioihexekontahexaphobia | (noun) fear of magic properties of the number 666 | - |
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| hexameter | (noun) a verse line having six metrical feet | - |
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| hexane | (noun) a colorless flammable liquid alkane derived from petroleum and used as a solvent | - |
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| hexapod | (noun) an animal having six feet | - |
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| hexenbesen | (noun) an abnormal tufted growth of small branches on a tree or shrub caused by fungi or insects or other physiological disturbance | Synonyms: staghead, witch broom, witches' broom |
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| hexestrol | (noun) estrogen compound used to treat menstrual irregularities and menopausal symptoms and to prevent pregnancy | - |
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| hexine | (noun) a hydrocarbon, C6H10, of the acetylene series. | - |
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| hexose | (noun) a monosaccharide that contains six carbon atoms per molecule | - |
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| homosexual | (noun) someone who is sexually attracted to persons of the same sex | Synonyms: gay, homo, homophile |
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| homosexualism | (noun) a sexual attraction to (or sexual relations with) persons of the same sex | Synonyms: gayness, homoeroticism, homosexuality, queerness |
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| homosexuality | (noun) a sexual attraction to (or sexual relations with) persons of the same sex | Synonyms: gayness, homoeroticism, homosexualism, queerness |
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| hyperextension | (noun) greater than normal extension | - |
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| hyperpyrexia | (noun) extremely high fever (especially in children) | - |
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| hypertext | (noun) machine-readable text that is not sequential but is organized so that related items of information are connected | - |
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| ibex | (noun) wild goat of mountain areas of Eurasia and northern Africa having large recurved horns | Synonyms: Capra ibex |
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| index | (noun) the finger next to the thumb | Synonyms: forefinger, index finger |
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| (noun) an alphabetical listing of names and topics along with page numbers where they are discussed | - |
| (noun) a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time | Synonyms: index number, indicant, indicator |
| (noun) a mathematical notation indicating the number of times a quantity is multiplied by itself | Synonyms: exponent, power |
| (noun) a numerical scale used to compare variables with one another or with some reference number | - |
| indexation | (noun) a system of economic regulation: wages and interest are tied to the cost-of-living index in order to reduce the effects of inflation | - |
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| indexer | (noun) someone who provides an index | - |
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| indexing | (noun) the act of classifying and providing an index in order to make items easier to retrieve | - |
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| inexactitude | (noun) the quality of being inexact | Synonyms: inexactness |
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| inexactness | (noun) the quality of being inexact | Synonyms: inexactitude |
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| inexhaustibility | (noun) The state or condition of being impossible to exhaust; of being unlimited. | - |
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| inexorability | (noun) mercilessness characterized by an unwillingness to relent or let up | Synonyms: inexorableness, relentlessness |
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| inexorableness | (noun) mercilessness characterized by an unwillingness to relent or let up | Synonyms: inexorability, relentlessness |
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