| rhea | (noun) larger of two tall fast-running flightless birds similar to ostriches but three-toed; found from Brazil to Patagonia | Synonyms: Rhea americana |
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| (noun) smaller of two tall fast-running flightless birds similar to ostriches but three-toed; found from Peru to Strait of Magellan | Synonyms: nandu, Pterocnemia pennata |
| rhenium | (noun) a rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys; is obtained as a by-product in refining molybdenum | Synonyms: atomic number 75, Re |
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| rheology | (noun) the branch of physics that studies the deformation and flow of matter | - |
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| rheometer | (noun) an instrument for measuring the flow of liquids (especially arterial blood) | - |
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| rheostat | (noun) resistor for regulating current | Synonyms: variable resistor |
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| rhesus | (noun) of southern Asia; used in medical research | Synonyms: Macaca mulatta, rhesus monkey |
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| rhetoric | (noun) study of the technique and rules for using language effectively (especially in public speaking) | - |
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| (noun) using language effectively to please or persuade | - |
| (noun) high-flown style; excessive use of verbal ornamentation | Synonyms: grandiloquence, grandiosity, magniloquence, ornateness |
| (noun) loud and confused and empty talk | Synonyms: empty talk, empty words, hot air, palaver |
| rhetorician | (noun) a person who delivers a speech or oration | Synonyms: orator, public speaker, speechifier, speechmaker |
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| rheum | (noun) a watery discharge from the mucous membranes (especially from the eyes or nose) | - |
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| rheumatic | (noun) a person suffering with rheumatism | - |
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| rheumatism | (noun) any painful disorder of the joints or muscles or connective tissues | - |
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| (noun) a chronic autoimmune disease with inflammation of the joints and marked deformities; something (possibly a virus) triggers an attack on the synovium by the immune system, which releases cytokines that stimulate an inflammatory reaction that can lead to the destruction of all components of the joint | Synonyms: atrophic arthritis, rheumatoid arthritis |
| rheumatologist | (noun) a physician specializing in rheumatic diseases | - |
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| rheumatology | (noun) the branch of medicine dealing with the study and treatment of pathologies of the muscles or tendons or joints | - |
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