Nouns starting with R

• rhodium — Noun – English ～ a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinum
• rhodochrosite — Noun – English ～ a mineral consisting of manganese carbonate; a source of manganese
• Rhododendron maxima — Noun – English ～ late-spring-blooming rhododendron of eastern North America having rosy to pink-purple flowers
• Rhododendron californicum — Noun – English ～ medium-sized rhododendron of Pacific coast of North America having large rosy brown-spotted flowers
• rhododendron — Noun – English ～ any shrub of the genus Rhododendron: evergreen shrubs or small shrubby trees having leathery leaves and showy clusters of campanulate (bell-shaped) flowers
• rhodolite — Noun – English ～ a red or pink variety of garnet used as a gemstone
• rhodomontade — Noun – English ～ vain and empty boasting
• rhodonite — Noun – English ～ a pink or red mineral consisting of crystalline manganese silicate; used as an ornamental stone
• Rhodope Mountains — Noun – English ～ a mountain range in the Balkan peninsula in southeastern Europe; extends along the border between Greece and Bulgaria
• Rhodophyceae — Noun – English ～ coextensive with the Rhodophyta: red algae
• Rhodophyta — Noun – English ～ lower plants; mostly marine and littoral eukaryotic algae
• rhodopsin — Noun – English ～ a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light
• Rhodosphaera rhodanthema — Noun – English ～ evergreen of Australia yielding a dark yellow wood
• Rhodosphaera — Noun – English ～ one species; an Australian evergreen sumac
• Rhodymenia palmata — Noun – English ～ coarse edible red seaweed
• Rhodymenia — Noun – English ～ type genus of the family Rhodymeniaceae
• Rhodymeniaceae — Noun – English ～ a family of protoctist
• Rhoeadales — Noun – English ～ an order of dicotyledonous plants
• rhomb — Noun – English ～ a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
• rhombencephalon — Noun – English ～ the posterior portion of the brain including cerebellum and brainstem

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