| rya | (noun) a shag rug made in Sweden | Synonyms: rya rug |
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| rydberg | (noun) a wave number characteristic of the wave spectrum of each element | Synonyms: rydberg constant, rydberg unit |
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| rye | (noun) whiskey distilled from rye or rye and malt | Synonyms: rye whiskey, rye whisky |
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| (noun) hardy annual cereal grass widely cultivated in northern Europe where its grain is the chief ingredient of black bread and in North America for forage and soil improvement | Synonyms: Secale cereale |
| (noun) the seed of the cereal grass | - |
| ryegrass | (noun) any of several annual or perennial Eurasian grasses | Synonyms: rye grass |
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