| rarebit | (noun) cheese melted with ale or beer served over toast | Synonyms: Welsh rabbit, Welsh rarebit |
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| rarefaction | (noun) a decrease in the density of something | - |
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| rareness | (noun) noteworthy scarcity | Synonyms: infrequency, rarity |
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| rariora | (noun) (plural) rare collector's items | - |
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| rarity | (noun) something unusual -- perhaps worthy of collecting | Synonyms: curio, curiosity, oddity, oddment, peculiarity |
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| (noun) a rarified quality | Synonyms: low density, tenuity |
| (noun) noteworthy scarcity | Synonyms: infrequency, rareness |