| rut | (noun) a settled and monotonous routine that is hard to escape | Synonyms: groove |
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| (noun) a groove or furrow (especially one in soft earth caused by wheels) | - |
| (noun) applies to nonhuman mammals: a state or period of heightened sexual arousal and activity | Synonyms: estrus, heat, oestrus |
| (verb) hollow out in the form of a furrow or groove | Synonyms: furrow, groove |
| (verb) be in a state of sexual excitement; of male mammals | - |
| rutabaga | (noun) the large yellow root of a rutabaga plant used as food | Synonyms: swede, swedish turnip, yellow turnip |
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| (noun) a cruciferous plant with a thick bulbous edible yellow root | Synonyms: Brassica napus napobrassica, rutabaga plant, swede, Swedish turnip, turnip cabbage |
| ruth | (noun) a feeling of sympathy and sorrow for the misfortunes of others | Synonyms: commiseration, pathos, pity |
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| ruthenium | (noun) a rare polyvalent metallic element of the platinum group; it is found associated with platinum | Synonyms: atomic number 44, Ru |
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| rutherford | (noun) a unit strength of a radioactive source equal to one million disintegrations per second | - |
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| rutherfordium | (noun) a radioactive transuranic element which has been synthesized | Synonyms: atomic number 104, element 104, Rf, unnilquadium, Unq |
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| ruthful | (adjective) feeling or expressing pain or sorrow for sins or offenses | Synonyms: contrite, remorseful, rueful |
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| ruthfulness | (noun) a state of gloomy sorrow | Synonyms: mournfulness, sorrowfulness |
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| ruthless | (adjective) without mercy or pity | Synonyms: pitiless, remorseless, unpitying |
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| ruthlessly | (adverb) in a ruthless manner | - |
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| ruthlessness | (noun) mercilessness characterized by a lack of pity | Synonyms: pitilessness |
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| (noun) feelings of extreme heartlessness | Synonyms: cruelty, mercilessness, pitilessness |
| rutile | (noun) a mineral consisting of titanium dioxide in crystalline form; occurs in metamorphic and plutonic rocks and is a major source of titanium | - |
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| rutted | (adjective) full of ruts | Synonyms: rutty |
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| ruttish | (adjective) feeling great sexual desire | Synonyms: aroused, horny, randy, steamy, turned on |
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| rutty | (adjective) full of ruts | Synonyms: rutted |
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