Nouns starting with R that are validated

• rear of tube — Noun – English ～ opening in the rear of the barrel of a gun where bullets can be loaded
• rectifying tube — Noun – English ～ a thermionic tube having two electrodes; used as a rectifier
• rough-and-tumble — Noun – English ～ disorderly fighting
• Russian tumbleweed — Noun – English ～ prickly bushy Eurasian plant; a troublesome weed in central and western United States
• Republic of Tunisia — Noun – English ～ a republic in northwestern Africa on the Mediterranean coast; achieved independence from France in 1956; "southern Tunisia is mostly desert"
• railroad tunnel — Noun – English ～ a tunnel through which the railroad track runs
• reaction turbine — Noun – English ～ a turbine with blades arranged to develop torque from gradual decrease of steam pressure from inlet to exhaust
• Republic of Turkey — Noun – English ～ a Eurasian republic in Asia Minor and the Balkans; on the collapse of the Ottoman Empire in 1918, the Young Turks, led by Kemal Ataturk, established a republic in 1923
• ruddy turnstone — Noun – English ～ common Arctic turnstone that winters in South America and Australia
• red-bellied turtle — Noun – English ～ freshwater turtle of Chesapeake Bay tributaries having red markings on the lower shell
• River Tyne — Noun – English ～ a river in northern England that flows east to the North Sea
• Rh-negative blood type — Noun – English ～ the blood group whose red cells lack the Rh factor (Rh antigen)
• Rh-positive blood type — Noun – English ～ the blood group (approximately 85% of people) whose red cells have the Rh factor (Rh antigen)
• roman type — Noun – English ～ a typeface used in ancient Roman inscriptions
• Rhus typhina — Noun – English ～ deciduous shrubby tree or eastern North America with compound leaves that turn brilliant red in fall and dense panicles of greenish yellow flowers followed by crimson acidic berries
• rat typhus — Noun – English ～ acute infection caused by rickettsia and transmitted by the bite of an infected flea; characterized by fever and chills and muscle aches and a rash
• Rhincodon typus — Noun – English ～ large spotted shark of warm surface waters worldwide; resembles a whale and feeds chiefly on plankton
• Robert Tyre Jones — Noun – English ～ United States golfer (1902-1971)
• Republic of Uganda — Noun – English ～ a landlocked republic in eastern Africa; achieved independence from the United Kingdom in 1962
• raw umber — Noun – English ～ greenish brown pigment

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