r
- n a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air
- n (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole
- n the 18th letter of the Roman alphabet
- n the length of a line segment between the center and circumference of a circle or sphere
r. b. cattell
- n American psychologist (born in England) who developed a broad theory of human behavior based on multivariate research (1905-1998)
r. buckminster fuller
- n United States architect who invented the geodesic dome (1895-1983)
r.v.
- n a motorized wheeled vehicle used for camping or other recreational activities
r and b
- n a combination of blues and jazz that was developed in the United States by Black musicians; an important precursor of rock 'n' roll
ra
- n an intensely radioactive metallic element that occurs in minute amounts in uranium ores
- n 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
- n (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
rabat
- n the capital of Morocco; located in the northwestern on the Atlantic coast
rabato
- n a wired or starched collar of intricate lace; worn in 17th century
rabbet
- n a rectangular groove made to hold two pieces together
- v join with a rabbet joint
- v cut a rectangular groove into
rabbet joint
- n a joint formed by fitting together two rabbeted boards
rabbi
- n spiritual leader of a Jewish congregation; qualified to expound and apply Jewish law
- n a Hebrew title of respect for a Jewish scholar or teacher
rabbi moses ben maimon
- n Spanish philosopher considered the greatest Jewish scholar of the Middle Ages who codified Jewish law in the Talmud (1135-1204)
rabbit
- n any of various burrowing animals of the family Leporidae having long ears and short tails; some domesticated and raised for pets or food
- n the fur of a rabbit
- n flesh of any of various rabbits or hares (wild or domesticated) eaten as food
- v hunt rabbits
rabbit's-foot fern
- n tropical American fern with brown scaly rhizomes cultivated for its large deeply lobed deep bluish-green fronds; sometimes placed in genus Polypodium
rabbit-eye blueberry
- n shrub of southeastern United States grown commercially especially for canning industry