| impermissibility | (noun) inadmissibility as a consequence of not being permitted | - |
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| inchworm | (noun) small hairless caterpillar having legs on only its front and rear segments; mostly larvae of moths of the family Geometridae | Synonyms: looper, measuring worm |
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| indeterminacy | (noun) the quality of being vague and poorly defined | Synonyms: indefiniteness, indefinity, indeterminateness, indetermination |
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| indeterminateness | (noun) the quality of being vague and poorly defined | Synonyms: indefiniteness, indefinity, indeterminacy, indetermination |
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| indetermination | (noun) the quality of being vague and poorly defined | Synonyms: indefiniteness, indefinity, indeterminacy, indeterminateness |
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| infirmary | (noun) a health facility where patients receive treatment | Synonyms: hospital |
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| infirmity | (noun) the state of being weak in health or body (especially from old age) | Synonyms: debility, feebleness, frailness, frailty, valetudinarianism |
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| informality | (noun) a manner that does not take forms and ceremonies seriously | - |
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| (noun) freedom from constraint or embarrassment | Synonyms: ease |
| informant | (noun) a person who supplies information | Synonyms: source |
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| (noun) someone who sees an event and reports what happened | Synonyms: witness, witnesser |
| informatics | (noun) the sciences concerned with gathering, manipulating, storing, retrieving, and classifying recorded information | Synonyms: information processing, information science, IP |
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| information | (noun) (communication theory) a numerical measure of the uncertainty of an outcome | Synonyms: entropy, selective information |
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| (noun) knowledge acquired through study or experience or instruction | - |
| (noun) a message received and understood | Synonyms: info |
| (noun) formal accusation of a crime | - |
| (noun) a collection of facts from which conclusions may be drawn | Synonyms: data |
| informer | (noun) one who reveals confidential information to the police or other authority | Synonyms: betrayer, blabber, rat, squealer |
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| informercial | (noun) a television commercial presented in the form of a short documentary | Synonyms: infomercial |
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| informing | (noun) a speech act that conveys information | Synonyms: making known |
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| (noun) to furnish incriminating evidence to an officer of the law (usually in return for favors) | Synonyms: ratting |
| inharmoniousness | (noun) a lack of harmony | Synonyms: disharmony |
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| intermarriage | (noun) marriage within one's own tribe or group as required by custom or law | Synonyms: endogamy, inmarriage |
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| (noun) marriage to a person belonging to a tribe or group other than your own as required by custom or law | Synonyms: exogamy |
| intermediary | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intercessor, intermediator, mediator |
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| intermediate | (noun) a substance formed during a chemical process before the desired product is obtained | - |
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| intermediation | (noun) the act of intervening for the purpose of bringing about a settlement | Synonyms: mediation |
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| intermediator | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intercessor, intermediary, mediator |
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| interment | (noun) the ritual placing of a corpse in a grave | Synonyms: burial, entombment, inhumation, sepulture |
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| intermezzo | (noun) a brief show (music or dance etc) inserted between the sections of a longer performance | Synonyms: entr'acte, interlude |
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| (noun) a short piece of instrumental music composed for performance between acts of a drama or opera | - |
| (noun) a short movement coming between the major sections of a symphony | - |
| intermission | (noun) the act of suspending activity temporarily | - |
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| (noun) a time interval during which there is a temporary cessation of something | Synonyms: break, interruption, pause, suspension |
| intermittence | (noun) the quality of being intermittent; subject to interruption or periodic stopping | Synonyms: intermittency |
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| intermittency | (noun) the quality of being intermittent; subject to interruption or periodic stopping | Synonyms: intermittence |
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| intermixture | (noun) the act of mixing together | Synonyms: admixture, commixture, mix, mixing, mixture |
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| (noun) an additional ingredient that is added by mixing with the base | Synonyms: admixture |
| (noun) any foodstuff made by combining different ingredients | Synonyms: concoction, mixture |
| iodoform | (noun) a yellowish crystalline solid with a penetrating odor; sometimes used as an antiseptic dressing | Synonyms: triiodomethane |
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| (noun) sweet smelling yellow solid haloform CHI3 | Synonyms: tri-iodomethane |
| isogeotherm | (noun) an isogram connecting points of equal temperature below the surface of the earth. | - |
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| isotherm | (noun) (meteorology) an isogram connecting points having the same temperature at a given time | - |
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| jiggermast | (noun) any small mast on a sailing vessel; especially the mizzenmast of a yawl | Synonyms: jigger |
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| jointworm | (noun) larva of chalcid flies injurious to the straw of wheat and other grains | Synonyms: strawworm |
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| karma | (noun) (Hinduism and Buddhism) the effects of a person's actions that determine his destiny in his next incarnation | - |
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| keratoderma | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratodermia |
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| keratodermia | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratoderma |
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| letterman | (noun) an athlete who has earned a letter in a school sport | - |
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| leukoderma | (noun) a congenital skin condition characterized by spots or bands of unpigmented skin | - |
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| lighterman | (noun) someone who operates a barge | Synonyms: bargee, bargeman |
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| lobsterman | (noun) a person whose occupation is catching lobsters | - |
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| lobworm | (noun) marine worms having a row of tufted gills along each side of the back; often used for fishing bait | Synonyms: lug, lugworm |
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| lugworm | (noun) marine worms having a row of tufted gills along each side of the back; often used for fishing bait | Synonyms: lobworm, lug |
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| lukewarmness | (noun) a warmness resembling the temperature of the skin | Synonyms: tepidity, tepidness |
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| (noun) lack of passion, force or animation | Synonyms: tepidness |
| lumberman | (noun) a person who fells trees | Synonyms: faller, feller, logger, lumberjack |
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| lumbermill | (noun) a mill for dressing logs and lumber | Synonyms: sawmill |
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| malformation | (noun) something abnormal or anomalous | Synonyms: miscreation |
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| (noun) an affliction in which some part of the body is misshapen or malformed | Synonyms: deformity, misshapenness |
| mammothermography | (noun) the use of thermography to detect breast tumors (which appear as hot spots) | - |
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| marmalade | (noun) a preserve made of the pulp and rind of citrus fruits | - |
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| marmite | (noun) a large pot especially one with legs used e.g. for cooking soup | - |
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| (noun) soup cooked in a large pot | - |
| marmoset | (noun) small soft-furred South American and Central American monkey with claws instead of nails | - |
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| marmot | (noun) stocky coarse-furred burrowing rodent with a short bushy tail found throughout the Northern Hemisphere; hibernates in winter | - |
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| mastermind | (noun) someone who creates new things | Synonyms: conceiver, originator |
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| (noun) someone who has exceptional intellectual ability and originality | Synonyms: brain, brainiac, Einstein, genius |
| mealworm | (noun) the larva of beetles of the family Tenebrionidae | - |
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| melanoderma | (noun) abnormally dark skin caused by increased deposits of melatonin | - |
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| mermaid | (noun) half woman and half fish; lives in the sea | - |
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| merman | (noun) half man and half fish; lives in the sea | - |
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| mesoderm | (noun) the middle germ layer that develops into muscle and bone and cartilage and blood and connective tissue | Synonyms: mesoblast |
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| metformin | (noun) an antidiabetic drug (trade name Glucophage) prescribed to treat type II diabetes | Synonyms: Glucophage |
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| midterm | (noun) an examination administered in the middle of an academic term | Synonyms: midterm exam, midterm examination |
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| (noun) middle of an academic term or a political term in office | - |
| (noun) the middle of the gestation period | - |
| misinformation | (noun) information that is incorrect | - |
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| motorman | (noun) the operator of streetcar | - |
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| motormouth | (noun) someone who talks incessantly | - |
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| murmur | (noun) a complaint uttered in a low and indistinct tone | Synonyms: grumble, grumbling, murmuring, mutter, muttering |
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| (noun) a schwa that is incidental to the pronunciation of a consonant | Synonyms: murmur vowel |
| (noun) a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech | Synonyms: murmuration, murmuring, mussitation, mutter, muttering |
| (noun) an abnormal sound of the heart; sometimes a sign of abnormal function of the heart valves | Synonyms: cardiac murmur, heart murmur |
| murmuration | (noun) a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech | Synonyms: murmur, murmuring, mussitation, mutter, muttering |
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| murmurer | (noun) a person who speaks softly and indistinctly | Synonyms: mumbler, mutterer |
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| murmuring | (noun) a complaint uttered in a low and indistinct tone | Synonyms: grumble, grumbling, murmur, mutter, muttering |
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| (noun) a low continuous indistinct sound; often accompanied by movement of the lips without the production of articulate speech | Synonyms: murmur, murmuration, mussitation, mutter, muttering |
| myrmecophile | (noun) an organism such as an insect that habitually shares the nest of a species of ant | - |
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| myrmecophyte | (noun) plant that affords shelter or food to ants that live in symbiotic relations with it | - |
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| myrmidon | (noun) a follower who carries out orders without question | - |
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| neurodermatitis | (noun) dermatitis in which localized areas (especially the forearms or back of the neck or outer part of the ankle) itch persistently; cause is unknown | - |
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| neurohormone | (noun) a hormone that is released by nerve impulses (e.g., norepinephrine or vasopressin) | - |
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| newspaperman | (noun) a male journalist employed to provide news stories for newspapers or broadcast media | Synonyms: pressman |
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| nitrochloroform | (noun) a heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas | Synonyms: chloropicrin |
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| nonconformance | (noun) failure to conform to accepted standards of behavior | Synonyms: nonconformity |
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| (noun) a lack of orthodoxy in thoughts or beliefs | Synonyms: nonconformism, nonconformity |
| nonconformism | (noun) the practice of nonconformity | - |
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| (noun) a lack of orthodoxy in thoughts or beliefs | Synonyms: nonconformance, nonconformity |
| nonconformist | (noun) someone who refuses to conform to established standards of conduct | Synonyms: recusant |
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| nonconformity | (noun) failure to conform to accepted standards of behavior | Synonyms: nonconformance |
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| (noun) unorthodoxy as a consequence of not conforming to expected standards or values | - |
| (noun) a lack of orthodoxy in thoughts or beliefs | Synonyms: nonconformance, nonconformism |
| (noun) lack of harmony or correspondence | - |
| nonperformance | (noun) failure to act with the prudence that a reasonable person would exercise under the same circumstances | Synonyms: carelessness, neglect, negligence |
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| nonuniformity | (noun) the quality of being diverse and interesting | - |
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| norm | (noun) a statistic describing the location of a distribution | Synonyms: average |
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| (noun) a standard or model or pattern regarded as typical | - |
| normal | (noun) something regarded as a normative example | Synonyms: convention, formula, pattern, rule |
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| normalcy | (noun) expectedness as a consequence of being usual or regular or common | Synonyms: normality |
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| (noun) being within certain limits that define the range of normal functioning | Synonyms: normality |
| normalisation | (noun) the imposition of standards or regulations | Synonyms: normalization, standardisation, standardization |
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| normaliser | (noun) a person who normalizes | Synonyms: normalizer |
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| normality | (noun) expectedness as a consequence of being usual or regular or common | Synonyms: normalcy |
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| (noun) conformity with the norm | - |
| (noun) (of a solution) concentration expressed in gram equivalents of solute per liter | Synonyms: N |
| (noun) being within certain limits that define the range of normal functioning | Synonyms: normalcy |
| normalization | (noun) the imposition of standards or regulations | Synonyms: normalisation, standardisation, standardization |
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| normalizer | (noun) a person who normalizes | Synonyms: normaliser |
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| normothermia | (noun) normal body temperature | - |
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| oligospermia | (noun) insufficient spermatozoa in the semen | - |
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| ormer | (noun) an abalone found near the Channel Islands | Synonyms: Haliotis tuberculata, sea-ear |
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| ormolu | (noun) brass that looks like gold; used to decorate furniture | - |
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| ostracoderm | (noun) extinct fish-like jawless vertebrate having a heavily armored body; of the Paleozoic | - |
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| overgarment | (noun) a garment worn over other garments | Synonyms: outer garment |
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| overmantel | (noun) a shelf over a mantelpiece | - |
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| overmuch | (noun) a quantity that is more than what is appropriate | Synonyms: overabundance, overmuchness, superabundance |
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| overmuchness | (noun) a quantity that is more than what is appropriate | Synonyms: overabundance, overmuch, superabundance |
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| pachyderm | (noun) any of various nonruminant hoofed mammals having very thick skin: elephant, rhinoceros, hippopotamus | - |
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| pachyderma | (noun) thickening of the skin (usually unilateral on an extremity) caused by congenital enlargement of lymph vessel and lymph vessel obstruction | Synonyms: nevoid elephantiasis |
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| panspermia | (noun) The hypothesis that microorganisms may transmit life from outer space to habitable bodies; or the process of such transmission. | - |
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| papermaking | (noun) the craft of making paper | - |
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| parathormone | (noun) hormone synthesized and released into the blood stream by the parathyroid glands; regulates phosphorus and calcium in the body and functions in neuromuscular excitation and blood clotting | Synonyms: parathyroid hormone |
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| parlormaid | (noun) a maid in a private home whose duties are to care for the parlor and the table and to answer the door | Synonyms: parlourmaid |
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