R-2
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～ street names for flunitrazepan
R
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～ (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
R and B
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～ a combination of blues and jazz that was developed in the United States by Black musicians; an important precursor of rock 'n' roll
R
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～ the 18th letter of the Roman alphabet
R. B. Cattell
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～ American psychologist (born in England) who developed a broad theory of human behavior based on multivariate research (1905-1998)
R
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～ a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
r
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～ the length of a line segment between the center and circumference of a circle or sphere
R. Buckminster Fuller
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～ United States architect who invented the geodesic dome (1895-1983)
R. J. Mitchell
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～ English aeronautical engineer (1895-1937)
R.I.
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～ a state in New England; one of the original 13 colonies; the smallest state
R.V.
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～ a motorized wheeled vehicle used for camping or other recreational activities
ra
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～ an intensely radioactive metallic element that occurs in minute amounts in uranium ores
RA
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～ (astronomy) the equatorial coordinate specifying the angle, measured eastward along the celestial equator, from the vernal equinox to the intersection of the hour circle that passes through an object in the sky; usually expressed in hours and minutes and seconds; used with declination to specify positions on the celestial sphere; "one hour of right ascension equals fifteen degrees"
Ra
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～ ancient Egyptian sun god with the head of a hawk; a universal creator; he merged with the god Amen as Amen-Ra to become the king of the gods
Rabat
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～ the capital of Morocco; located in the northwestern on the Atlantic coast
rabato
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～ a wired or starched collar of intricate lace; worn in 17th century
rabbet plane
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～ a woodworking plane designed to cut rabbets
rabbet
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～ a rectangular groove made to hold two pieces together
rabbet joint
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～ a joint formed by fitting together two rabbeted boards
Rabbi Moses Ben Maimon
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～ Spanish philosopher considered the greatest Jewish scholar of the Middle Ages who codified Jewish law in the Talmud (1135-1204)