| 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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| ruthfulness | (noun) a state of gloomy sorrow | Synonyms: mournfulness, sorrowfulness |
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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 |