Nouns starting with R

• ringworm shrub — Noun – English ～ tropical shrub (especially of Americas) having yellow flowers and large leaves whose juice is used as a cure for ringworm and poisonous bites; sometimes placed in genus Cassia
• red shrubby penstemon — Noun – English ～ low branching dark green shrub with bunches of brick-red flowers at ends of branches; coastal ranges and foothills of northern California
• radiation sickness — Noun – English ～ syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours; "he was suffering from radiation"
• railroad siding — Noun – English ～ a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass
• raw sienna — Noun – English ～ a yellowish-brown pigment made from untreated sienna
• raw sienna — Noun – English ～ a medium to dark tan color
• Republic of Sierra Leone — Noun – English ～ a republic in West Africa; achieved independence from the United Kingdom in 1961
• Raynaud's sign — Noun – English ～ cyanosis of the extremities; can occur when a spasm of the blood vessels is caused by exposure to cold or by strong emotion
• radical sign — Noun – English ～ a sign indicating the extraction of a root
• radio signal — Noun – English ～ a radio wave used to transmit and receive messages
• radiotelegraphic signal — Noun – English ～ a signal transmitted by telegraphy
• red silk cotton — Noun – English ～ a plant fiber from the red silk-cotton tree of eastern India; inferior to kapok
• red-flowered silky oak — Noun – English ～ tall shrub with cylindrical racemes of red flowers and pinnatifid leaves silky and grey beneath; eastern Australia
• red silver fir — Noun – English ～ medium to tall fir of western North America having a conic crown and branches in tiers; leaves smell of orange when crushed
• Rea Silvia — Noun – English ～ (Roman mythology) a vestal virgin who became the mother by Mars of the twins Romulus and Remus
• Rhea Silvia — Noun – English ～ (Roman mythology) a vestal virgin who became the mother by Mars of the twins Romulus and Remus
• remission of sin — Noun – English ～ the act of absolving or remitting; formal redemption as pronounced by a priest in the sacrament of penance
• Republic of Singapore — Noun – English ～ a country in southeastern Asia on the island of Singapore; achieved independence from Malaysia in 1965
• red siskin — Noun – English ～ South American species of scarlet finch with black head and wings and tail
• restriction site — Noun – English ～ the specific sites at which a restriction enzyme will cleave DNA

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