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actinide series

(Encyclopedia) actinide series, a series of radioactive metallic elements in Group 3 of the periodic table. Members of the series are often called actinides, although actinium (at. no. 89) is not…

Rainwater, James

(Encyclopedia) Rainwater, James, 1917–86, American physicist, Ph.D. Columbia, 1946. After working on the Manhattan Project as a student during World War II, he became a professor of physics at…

Rainy Lake

(Encyclopedia) Rainy Lake, c.345 sq mi (890 sq km), on the U.S.-Canada border in N Minn. and W Ont. The lake, irregular in shape and dotted with islands, is located in rough woodlands. Its outlet,…

Raipur

(Encyclopedia) RaipurRaipurrīˈp&oobreve;r [key], city (1991 pop. 462,694), capital of Chhattisgarh state, E central India, on the Kharun River. It is a district administrative center and an…

Raisi, Ebrahim

(Encyclopedia) Raisi, Ebrahim , 1960- , Iranian cleric and political leader, b. Mashhad, as Ebrahim Raisol-Sadati. Raisi’s educational history is…

Raisin, river, United States

(Encyclopedia) Raisin, river, 115 mi (185 km) long, rising in S Mich. and flowing E to Lake Erie at Monroe, Mich. After Detroit's surrender in the War of 1812, U.S. troops under Gen. James Winchester…

raisin, in botany and cooking

(Encyclopedia) raisin, dried fruit of certain varieties of grapevines bearing grapes with a high content of sugar and solid flesh. Although the fruit is sometimes artificially dehydrated, it is…

Rajagopalachari, Chakravarti

(Encyclopedia) Rajagopalachari, ChakravartiRajagopalachari, Chakravartichəkrəvärˈtē räˌjəgōpäˈləchäˌrē [key], 1878–1972, Indian political leader. He was educated in Bangalore (now Bengaluru) and…

Rajahmundry

(Encyclopedia) Rajahmundry, city, India: see Rajamahendravaram.