| crossheading | (noun) a heading of a subsection printed within the body of the text | Synonyms: crosshead |
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| crowdfunding | (noun) Funding from a large number of small backers | - |
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| crowding | (noun) a situation in which people or things are crowded together | - |
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| crudites | (noun) raw vegetables cut into bite-sized strips and served with a dip | - |
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| crudity | (noun) an impolite manner that is vulgar and lacking tact or refinement | Synonyms: crudeness, gaucheness |
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| (noun) a wild or unrefined state | Synonyms: crudeness, primitiveness, primitivism, rudeness |
| cryptorchidism | (noun) failure of one or both testes to move into the scrotum as the male fetus develops | Synonyms: cryptorchidy, cryptorchism |
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| ctenidium | (noun) comb-like respiratory structure serving as the gill of certain mollusks | - |
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| cuckolding | (noun) A sexual act where a married person has sex with another person while their spouse watches | - |
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| cupidity | (noun) extreme greed for material wealth | Synonyms: avarice, avariciousness, covetousness |
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| custodial | (adjective) providing protective supervision; watching over or safeguarding | Synonyms: tutelar, tutelary |
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| custodian | (noun) one having charge of buildings or grounds or animals | Synonyms: keeper, steward |
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| custodianship | (noun) the position of custodian | - |
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| cyclopaedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopedia, encyclopaedia, encyclopedia |
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| cyclopedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopaedia, encyclopaedia, encyclopedia |
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| cymbidium | (noun) any of various plants of the genus Cymbidium having narrow leaves and a long drooping cluster of numerous showy and variously colored boat-shaped flowers; extensively hybridized and cultivated as houseplants and important florists' flowers | Synonyms: cymbid |
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| cypripedia | (noun) a plant or flower of the genus Cypripedium | - |
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| cyproheptadine | (noun) an antihistamine (trade name Periactin) used to treat some allergic reactions | Synonyms: Periactin |
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| cytidine | (noun) a nucleoside component of DNA; composed of cytosine and deoxyribose | Synonyms: deoxycytidine |
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| daffodil | (noun) any of numerous varieties of Narcissus plants having showy often yellow flowers with a trumpet-shaped central crown | Synonyms: Narcissus pseudonarcissus |
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| dandified | (adjective) affecting extreme elegance in dress and manner | Synonyms: dandyish, foppish |
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| dandify | (verb) dress like a dandy | - |
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| dandily | (adverb) in a dandy manner | - |
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| deciding | (adjective) having the power or quality of deciding | Synonyms: determinant, determinative, determining |
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| (noun) the cognitive process of reaching a decision | Synonyms: decision making |
| decoding | (noun) the activity of making clear or converting from code into plain text | Synonyms: decipherment, decryption |
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| dedicate | (verb) set apart to sacred uses with solemn rites, of a church | - |
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| (verb) give entirely to a specific person, activity, or cause | Synonyms: commit, consecrate, devote, give |
| (verb) inscribe or address by way of compliment | - |
| (verb) open to public use, as of a highway, park, or building | - |
| dedicated | (adjective) devoted to a cause or ideal or purpose | - |
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| (adjective) solemnly dedicated to or set apart for a high or sacred purpose | Synonyms: consecrate, consecrated |
| dedication | (noun) the act of binding yourself (intellectually or emotionally) to a course of action | Synonyms: allegiance, commitment, loyalty |
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| (noun) complete and wholehearted fidelity | - |
| (noun) a short message (as in a book or musical work or on a photograph) dedicating it to someone or something | Synonyms: inscription |
| (noun) a message that makes a pledge | Synonyms: commitment |
| (noun) a ceremony in which something (as a building) is dedicated to some goal or purpose | - |
| dedifferentiate | (verb) lose specialization in form or function | - |
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| dedifferentiated | (adjective) having experienced or undergone dedifferentiation or the loss of specialization in form or function | - |
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| dedifferentiation | (noun) the loss of specialization in form or function | - |
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| defending | (adjective) attempting to or designed to prevent an opponent from winning or scoring | - |
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| degrading | (adjective) used of conduct; characterized by dishonor | Synonyms: debasing |
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| (adjective) harmful to the mind or morals | Synonyms: corrupting |
| dehumidifier | (noun) an appliance to extract moisture from the air and make the environment more comfortable | - |
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| dehumidify | (verb) make less humid | - |
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| delavirdine | (noun) a non-nucleoside reverse transcriptase inhibitor (trade name Rescriptor) used to treat AIDS and HIV | Synonyms: Rescriptor |
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| demanding | (adjective) requiring more than usually expected or thought due; especially great patience and effort and skill | - |
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| demandingly | (adverb) in a demanding manner | - |
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| deoxidise | (verb) to remove oxygen from a compound, or cause to react with hydrogen or form a hydride, or to undergo an increase in the number of electrons | Synonyms: deoxidize, reduce |
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| deoxidize | (verb) to remove oxygen from a compound, or cause to react with hydrogen or form a hydride, or to undergo an increase in the number of electrons | Synonyms: deoxidise, reduce |
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| deoxycytidine | (noun) a nucleoside component of DNA; composed of cytosine and deoxyribose | Synonyms: cytidine |
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| deoxythymidine | (noun) a nucleoside component of DNA; composed of thymine and deoxyribose | Synonyms: thymidine |
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| descending | (adjective) coming down or downward | - |
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| dextrocardia | (noun) abnormal condition where the heart is located toward the right side of the chest | - |
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| diabatic | (adjective) involving a transfer of heat | - |
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| diabetes | (noun) a polygenic disease characterized by abnormally high glucose levels in the blood; any of several metabolic disorders marked by excessive urination and persistent thirst | - |
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| diabetic | (adjective) of or relating to or causing diabetes | - |
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| (adjective) suffering from diabetes | - |
| (noun) someone who has diabetes | - |
| diablotin | (noun) a thin round slice of bread usually served with soup, especially consomme. | - |
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| diabolatry | (noun) the acts or rites of worshiping devils | Synonyms: demonolatry, devil-worship |
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| diabolic | (adjective) extremely evil or cruel; expressive of cruelty or befitting hell | Synonyms: demonic, diabolical, fiendish, hellish, infernal, satanic, unholy |
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| (adjective) showing the cunning or ingenuity or wickedness typical of a devil | Synonyms: devilish, diabolical, mephistophelean, mephistophelian |
| diabolical | (adjective) extremely evil or cruel; expressive of cruelty or befitting hell | Synonyms: demonic, diabolic, fiendish, hellish, infernal, satanic, unholy |
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| (adjective) showing the cunning or ingenuity or wickedness typical of a devil | Synonyms: devilish, diabolic, mephistophelean, mephistophelian |
| diabolically | (adverb) as a devil; in an evil manner | Synonyms: devilishly, fiendishly |
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| diabolise | (verb) turn into a devil or make devilish | Synonyms: devilise, devilize, diabolize |
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| diabolism | (noun) a belief in and reverence for devils (especially Satan) | Synonyms: demonism, Satanism |
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| diabolist | (noun) an adherent of Satan or Satanism | Synonyms: Satanist |
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| diabolize | (verb) turn into a devil or make devilish | Synonyms: devilise, devilize, diabolise |
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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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| diachronic | (adjective) used of the study of a phenomenon (especially language) as it changes through time | Synonyms: historical |
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| diachrony | (noun) the study of linguistic change | Synonyms: diachronic linguistics, historical linguistics |
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| diacritic | (adjective) capable of distinguishing | Synonyms: diacritical |
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| (noun) a mark added to a letter to indicate a special pronunciation | Synonyms: diacritical mark |
| diacritical | (adjective) capable of distinguishing | Synonyms: diacritic |
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| diadem | (noun) an ornamental jeweled headdress signifying sovereignty | Synonyms: crown |
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| diadromous | (adjective) (used of fish) migratory between fresh and salt waters | - |
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| diaeresis | (noun) a diacritical mark (two dots) placed over a vowel to indicate that it does not form a diphthong with an adjacent vowel | Synonyms: dieresis |
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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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| diagnosable | (adjective) capable of being diagnosed | - |
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| diagnose | (verb) determine or distinguish the nature of a problem or an illness through a diagnostic analysis | Synonyms: name |
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| (verb) subject to a medical analysis | - |
| diagnosing | (noun) identifying the nature or cause of some phenomenon | Synonyms: diagnosis |
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| diagnosis | (noun) identifying the nature or cause of some phenomenon | Synonyms: diagnosing |
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| diagnostic | (adjective) concerned with diagnosis; used for furthering diagnosis | - |
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| (adjective) characteristic or indicative of a disease | Synonyms: symptomatic |
| diagnostician | (noun) a doctor who specializes in medical diagnosis | Synonyms: pathologist |
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| diagnostics | (noun) the branch of medical science dealing with the classification of disease | Synonyms: nosology |
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| diagonal | (adjective) having an oblique or slanted direction | Synonyms: aslant, aslope, slanted, slanting, sloped, sloping |
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| (adjective) connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face | - |
| (noun) a punctuation mark (/) used to separate related items of information | Synonyms: separatrix, slash, solidus, stroke, virgule |
| (noun) an oblique line of squares of the same color on a checkerboard | - |
| (noun) (mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry | - |
| (noun) a line or cut across a fabric that is not at right angles to a side of the fabric | Synonyms: bias |
| (noun) (geometry) a straight line connecting any two vertices of a polygon that are not adjacent | - |
| diagonalisation | (noun) changing a square matrix to diagonal form (with all non-zero elements on the principal diagonal) | Synonyms: diagonalization |
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| diagonalise | (verb) transform a matrix to a diagonal matrix | Synonyms: diagonalize |
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| diagonalizable | (adjective) capable of being transformed into a diagonal matrix | - |
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| diagonalization | (noun) changing a square matrix to diagonal form (with all non-zero elements on the principal diagonal) | Synonyms: diagonalisation |
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| diagonalize | (verb) transform a matrix to a diagonal matrix | Synonyms: diagonalise |
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| diagonally | (adverb) in a diagonal manner | - |
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| diagram | (noun) a drawing intended to explain how something works; a drawing showing the relation between the parts | - |
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| (verb) make a schematic or technical drawing that shows interactions among variables or how something is constructed | Synonyms: plot |
| diagrammatic | (adjective) shown or represented by diagrams | Synonyms: diagrammatical |
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| diagrammatical | (adjective) shown or represented by diagrams | Synonyms: diagrammatic |
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| diagrammatically | (adverb) in a diagrammatic manner | Synonyms: graphically |
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| diagramming | (noun) providing a chart or outline of a system | Synonyms: schematisation, schematization |
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| diakinesis | (noun) the final stage of the prophase of meiosis | - |
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| dial | (noun) the face of a timepiece; graduated to show the hours | - |
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| (noun) a disc on a telephone that is rotated a fixed distance for each number called | Synonyms: telephone dial |
| (noun) the circular graduated indicator on various measuring instruments | - |
| (noun) the control on a radio or television set that is used for tuning | - |
| (verb) choose by means of a dial | - |
| (verb) operate a dial to select a telephone number | - |
| dialect | (noun) the usage or vocabulary that is characteristic of a specific group of people | Synonyms: accent, idiom |
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| dialectal | (adjective) belonging to or characteristic of a dialect | - |
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| dialectic | (adjective) of or relating to or employing dialectic | Synonyms: dialectical |
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| (noun) any formal system of reasoning that arrives at the truth by the exchange of logical arguments | - |
| (noun) a contradiction of ideas that serves as the determining factor in their interaction | - |
| dialectical | (adjective) of or relating to or employing dialectic | Synonyms: dialectic |
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| dialectically | (adverb) in a dialectic manner | - |
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| dialectician | (noun) a logician skilled in dialectic | - |
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| dialectics | (noun) a rationale for dialectical materialism based on change through the conflict of opposing forces | - |
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| dialectology | (noun) the branch of philology that is devoted to the study of dialects | - |
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| dialog | (noun) the lines spoken by characters in drama or fiction | Synonyms: dialogue |
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| (noun) a conversation between two persons | Synonyms: dialogue, duologue |
| (noun) a literary composition in the form of a conversation between two people | Synonyms: dialogue |
| dialogism | (noun) the use in a text of different tones or viewpoints, whose interaction or contradiction is important to the text's interpretation. | - |
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| dialogue | (noun) the lines spoken by characters in drama or fiction | Synonyms: dialog |
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| (noun) a conversation between two persons | Synonyms: dialog, duologue |
| (noun) a literary composition in the form of a conversation between two people | Synonyms: dialog |
| (noun) a discussion intended to produce an agreement | Synonyms: negotiation, talks |
| dialyse | (verb) separate by dialysis | Synonyms: dialyze |
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| dialysis | (noun) separation of substances in solution by means of their unequal diffusion through semipermeable membranes | - |
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| dialyze | (verb) separate by dialysis | Synonyms: dialyse |
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| dialyzer | (noun) a medical instrument for separating substances in solution by unequal diffusion through semipermeable membranes | Synonyms: dialysis machine |
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