| benzoquinone | (noun) any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes | Synonyms: quinone |
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| chloroquine | (noun) an antimalarial drug used to treat malaria and amebic dysentery and systemic lupus erythematosus | - |
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| equine | (noun) hoofed mammals having slender legs and a flat coat with a narrow mane along the back of the neck | Synonyms: equid |
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| equinoctial | (noun) the great circle on the celestial sphere midway between the celestial poles | Synonyms: celestial equator, equinoctial circle, equinoctial line |
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| equinox | (noun) (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic | Synonyms: equinoctial point |
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| (noun) either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length | - |
| harlequin | (noun) a clown or buffoon (after the Harlequin character in the commedia dell'arte) | - |
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| harlequinade | (noun) acting like a clown or buffoon | Synonyms: buffoonery, clowning, frivolity, japery, prank |
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| hydroxychloroquine | (noun) anti-inflammatory drug (trade name Plaquenil) used in the treatment of rheumatoid arthritis and malaria and lupus erythematosus | Synonyms: Plaquenil |
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| iodochlorhydroxyquin | (noun) drug used to treat certain fungal infection (as athlete's foot) | Synonyms: Clioquinol |
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| lambrequin | (noun) short and decorative hanging for a shelf edge or top of a window casing | - |
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| (noun) a scarf that covers a knight's helmet | - |
| mannequin | (noun) a life-size dummy used to display clothes | Synonyms: form, manakin, manikin, mannikin |
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| (noun) a woman who wears clothes to display fashions | Synonyms: fashion model, manakin, manikin, mannikin, model |
| mefloquine | (noun) an antimalarial drug (trade name Lariam and Mephaquine) that is effective in cases that do not respond to chloroquine; said to produce harmful neuropsychiatric effects on some people | Synonyms: Lariam, mefloquine hydrochloride, Mephaquine |
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| naphthoquinone | (noun) a fat-soluble vitamin that helps in the clotting of blood | Synonyms: antihemorrhagic factor, vitamin K |
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| palanquin | (noun) a closed litter carried on the shoulders of four bearers | Synonyms: palankeen |
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| pasquinade | (noun) a composition that imitates or misrepresents somebody's style, usually in a humorous way | Synonyms: burlesque, lampoon, mockery, parody, put-on, send-up, sendup, spoof, takeoff, travesty |
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| phylloquinone | (noun) a form of vitamin K, based on 2-methyl-1,4-naphthoquinone, with a 3-phytyl substituent | Synonyms: phytonadione, vitamin K1 |
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| primaquine | (noun) synthetic antimalarial drug | - |
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| quin | (noun) one of five children born at the same time from the same pregnancy | Synonyms: quint, quintuplet |
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| quinacrine | (noun) a drug (trade name Atabrine) used to treat certain worm infestations and once used to treat malaria | Synonyms: Atabrine, mepacrine, quinacrine hydrochloride |
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| quince | (noun) aromatic acid-tasting pear-shaped fruit used in preserves | - |
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| (noun) small Asian tree with pinkish flowers and pear-shaped fruit; widely cultivated | Synonyms: Cydonia oblonga, quince bush |
| quincentenary | (noun) the 500th anniversary (or the celebration of it) | Synonyms: quincentennial |
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| quincentennial | (noun) the 500th anniversary (or the celebration of it) | Synonyms: quincentenary |
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| quinidine | (noun) cardiac drug (trade names Quinidex and Quinora) used to treat certain heart arrhythmias | Synonyms: Quinidex, Quinora |
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| quinine | (noun) a bitter alkaloid extracted from chinchona bark; used in malaria therapy | - |
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| quinone | (noun) any of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes | Synonyms: benzoquinone |
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| quinquennium | (noun) a period of five years | - |
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| quinsy | (noun) a painful pus filled inflammation of the tonsils and surrounding tissues; usually a complication of tonsillitis | Synonyms: peritonsillar abscess |
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| quint | (noun) one of five children born at the same time from the same pregnancy | Synonyms: quin, quintuplet |
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| (noun) the cardinal number that is the sum of four and one | Synonyms: 5, cinque, fin, five, fivesome, Little Phoebe, pentad, Phoebe, quintet, quintuplet, V |
| quintal | (noun) a United States unit of weight equivalent to 100 pounds | Synonyms: cental, centner, cwt, hundredweight, short hundredweight |
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| (noun) a unit of weight equal to 100 kilograms | - |
| quintessence | (noun) the purest and most concentrated essence of something | - |
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| (noun) the most typical example or representative of a type | - |
| (noun) the fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies | Synonyms: ether |
| quintet | (noun) a musical composition for five performers | Synonyms: quintette |
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| (noun) five people considered as a unit | Synonyms: fivesome, quintette |
| (noun) a set of five similar things considered as a unit | Synonyms: quintette, quintuple, quintuplet |
| (noun) five performers or singers who perform together | Synonyms: quintette |
| (noun) the cardinal number that is the sum of four and one | Synonyms: 5, cinque, fin, five, fivesome, Little Phoebe, pentad, Phoebe, quint, quintuplet, V |
| quintette | (noun) a musical composition for five performers | Synonyms: quintet |
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| (noun) five people considered as a unit | Synonyms: fivesome, quintet |
| (noun) a set of five similar things considered as a unit | Synonyms: quintet, quintuple, quintuplet |
| (noun) five performers or singers who perform together | Synonyms: quintet |
| quintillion | (noun) the number that is represented as a one followed by 18 zeros in the US | - |
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| quintillionth | (noun) one part in a quintillion equal parts | Synonyms: one-quintillionth |
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| quintipara | (noun) (obstetrics) woman who has given birth to a viable infant in each of five pregnancies | - |
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| quintuple | (noun) a set of five similar things considered as a unit | Synonyms: quintet, quintette, quintuplet |
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| quintuplet | (noun) a set of five similar things considered as a unit | Synonyms: quintet, quintette, quintuple |
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| (noun) one of five children born at the same time from the same pregnancy | Synonyms: quin, quint |
| (noun) the cardinal number that is the sum of four and one | Synonyms: 5, cinque, fin, five, fivesome, Little Phoebe, pentad, Phoebe, quint, quintet, V |
| quintupling | (noun) increasing by a factor of five | - |
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| ramequin | (noun) a small fireproof dish used for baking and serving individual portions | Synonyms: ramekin |
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| (noun) a cheese dish made with egg and bread crumbs that is baked and served in individual fireproof dishes | Synonyms: ramekin |
| saquinavir | (noun) a weak protease inhibitor (trade name Invirase) used in treating HIV | Synonyms: Invirase |
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| sequin | (noun) adornment consisting of a small piece of shiny material used to decorate clothing | Synonyms: diamante, spangle |
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| squinch | (noun) a small arch built across the interior angle of two walls (usually to support a spire) | - |
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| squint | (noun) the act of squinting; looking with the eyes partly closed | - |
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| (noun) abnormal alignment of one or both eyes | Synonyms: strabismus |
| squinter | (noun) a person with strabismus | Synonyms: squint-eye |
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| ubiquinone | (noun) any of several quinones found in living cells and that function as coenzymes that transfer electrons from one molecule to another in cell respiration | Synonyms: coenzyme Q |
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