| deuce | (noun) one of the four playing cards in a deck that have two spots | Synonyms: two |
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| (noun) a word used in exclamations of confusion | Synonyms: devil, dickens |
| (noun) the cardinal number that is the sum of one and one or a numeral representing this number | Synonyms: 2, II, two |
| (noun) a tie in tennis or table tennis that requires winning two successive points to win the game | - |
| deuced | (adjective) expletives used informally as intensifiers | Synonyms: blame, blamed, blasted, blessed, damn, damned, darned, goddam, goddamn, goddamned, infernal |
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| deucedly | (adverb) (used as intensives) excessively | Synonyms: deadly, devilishly, insanely, madly |
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| deuteranopia | (noun) dichromacy characterized by a lowered sensitivity to green light resulting in an inability to distinguish green and purplish-red | Synonyms: Daltonism, green-blindness |
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| deuteranopic | (adjective) inability to see the color green or to distinguish green and purplish-red | Synonyms: green-blind |
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| deuterium | (noun) an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) | Synonyms: heavy hydrogen |
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| deuteron | (noun) the nucleus of deuterium; consists of one proton and one neutron; used as a bombarding particle in accelerators | - |
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| deutzia | (noun) any of various shrubs of the genus Deutzia having usually toothed opposite leaves and shredding bark and white or pink flowers in loose terminal clusters | - |
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