| agon | (noun) a festivity in ancient Greece at which competitors contended for prizes | - |
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| agonist | (noun) (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction | - |
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| (noun) a muscle that contracts while another relaxes | - |
| (noun) someone involved in a contest or battle (as in an agon) | - |
| (noun) the principal character in a work of fiction | Synonyms: protagonist |
| agony | (noun) intense feelings of suffering; acute mental or physical pain | Synonyms: torment, torture |
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| (noun) a state of acute pain | Synonyms: excruciation, suffering |
| antagonism | (noun) (biochemistry) interference in or inhibition of the physiological action of a chemical substance by another having a similar structure | - |
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| (noun) an actively expressed feeling of dislike and hostility | - |
| (noun) the relation between opposing principles or forces or factors | - |
| (noun) a state of deep-seated ill-will | Synonyms: enmity, hostility |
| antagonist | (noun) a drug that neutralizes or counteracts the effects of another drug | - |
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| (noun) a muscle that relaxes while another contracts | - |
| (noun) someone who offers opposition | Synonyms: adversary, opponent, opposer, resister |
| aragonite | (noun) a mineral form of crystalline calcium carbonate; dimorphic with calcite | - |
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| bandwagon | (noun) a large ornate wagon for carrying a musical band | - |
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| (noun) a popular trend that attracts growing support | - |
| battlewagon | (noun) large and heavily armoured warship | Synonyms: battleship |
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| decagon | (noun) a polygon with 10 sides and 10 angles | - |
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| diagonal | (noun) a punctuation mark (/) used to separate related items of information | Synonyms: separatrix, slash, solidus, stroke, virgule |
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| (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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| diagonalization | (noun) changing a square matrix to diagonal form (with all non-zero elements on the principal diagonal) | Synonyms: diagonalisation |
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| dodecagon | (noun) a twelve-sided polygon | - |
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| dragon | (noun) any of several small tropical Asian lizards capable of gliding by spreading winglike membranes on each side of the body | Synonyms: flying dragon, flying lizard |
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| (noun) a fiercely vigilant and unpleasant woman | Synonyms: tartar |
| (noun) a creature of Teutonic mythology; usually represented as breathing fire and having a reptilian body and sometimes wings | Synonyms: European dragon, firedrake |
| dragonet | (noun) small often brightly colored scaleless marine bottom-dwellers; found in tropical and warm temperate waters of Europe and America | - |
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| dragonfly | (noun) slender-bodied non-stinging insect having iridescent wings that are outspread at rest; adults and nymphs feed on mosquitoes etc. | Synonyms: darning needle, devil's darning needle, mosquito hawk, sewing needle, skeeter hawk, snake doctor, snake feeder |
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| dragonhead | (noun) American herb having sharply serrate lanceolate leaves and spikes of blue to violet flowers | Synonyms: Dracocephalum parviflorum, dragon's head |
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| estragon | (noun) fresh leaves (or leaves preserved in vinegar) used as seasoning | Synonyms: tarragon |
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| (noun) aromatic perennial of southeastern Russia | Synonyms: Artemisia dracunculus, tarragon |
| flagon | (noun) a large metal or pottery vessel with a handle and spout; used to hold alcoholic beverages (usually wine) | - |
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| glucagon | (noun) a hormone secreted by the pancreas; stimulates increases in blood sugar levels in the blood (thus opposing the action of insulin) | - |
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| heptagon | (noun) a seven-sided polygon | - |
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| hexagon | (noun) a six-sided polygon | - |
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| martagon | (noun) lily with small dull purple flowers of northwestern Europe and northwestern Asia | Synonyms: Lilium martagon, Turk's-cap |
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| milkwagon | (noun) wagon for delivering milk | Synonyms: milk wagon |
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| nonagon | (noun) a nine-sided polygon | - |
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| octagon | (noun) an eight-sided polygon | - |
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| paragon | (noun) an ideal instance; a perfect embodiment of a concept | Synonyms: beau ideal, idol, perfection |
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| (noun) model of excellence or perfection of a kind; one having no equal | Synonyms: apotheosis, ideal, nonesuch, nonpareil, nonsuch, saint |
| paragonite | (noun) a colorless or pale brown mica with sodium | - |
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| pendragon | (noun) the supreme war chief of the ancient Britons | - |
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| pentagon | (noun) a five-sided polygon | - |
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| protagonism | (noun) active support of an idea or cause etc.; especially the act of pleading or arguing for something | Synonyms: advocacy |
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| protagonist | (noun) a person who backs a politician or a team etc. | Synonyms: admirer, booster, champion, friend, supporter |
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| (noun) the principal character in a work of fiction | Synonyms: agonist |
| snapdragon | (noun) a garden plant of the genus Antirrhinum having showy white or yellow or crimson flowers resembling the face of a dragon | - |
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| tarragon | (noun) fresh leaves (or leaves preserved in vinegar) used as seasoning | Synonyms: estragon |
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| (noun) aromatic perennial of southeastern Russia | Synonyms: Artemisia dracunculus, estragon |
| tetragon | (noun) a four-sided polygon | Synonyms: quadrangle, quadrilateral |
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| undecagon | (noun) an eleven-sided polygon | - |
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| wagon | (noun) any of various kinds of wheeled vehicles drawn by an animal or a tractor | Synonyms: waggon |
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| (noun) a car that has a long body and rear door with space behind rear seat | Synonyms: beach waggon, beach wagon, estate car, station waggon, station wagon, waggon |
| (noun) van used by police to transport prisoners | Synonyms: black Maria, paddy wagon, patrol wagon, police van, police wagon |
| (noun) a child's four-wheeled toy cart sometimes used for coasting | Synonyms: coaster wagon |
| wagoner | (noun) the driver of a wagon | Synonyms: waggoner |
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| wagonwright | (noun) a wagon maker | Synonyms: waggonwright, wainwright |
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