r

the length of a line segment between the center and circumference of a circle or sphere ; the 18th letter of the Roman alphabet ; (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole ; 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-2

street names for flunitrazepan ;

r. b. cattell

American psychologist (born in England) who developed a broad theory of human behavior based on multivariate research (1905-1998) ;

r. buckminster fuller

United States architect who invented the geodesic dome (1895-1983) ;

r. j. mitchell

English aeronautical engineer (1895-1937) ;

r.v.

a motorized wheeled vehicle used for camping or other recreational activities ;

r and b

a combination of blues and jazz that was developed in the United States by Black musicians; an important precursor of rock 'n' roll ;

ra

(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" ; 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 ; an intensely radioactive metallic element that occurs in minute amounts in uranium ores ;

rabat

the capital of Morocco; located in the northwestern on the Atlantic coast ;

rabato

a wired or starched collar of intricate lace; worn in 17th century ;

rabbet

a rectangular groove made to hold two pieces together ;

rabbet joint

a joint formed by fitting together two rabbeted boards ;

rabbet plane

a woodworking plane designed to cut rabbets ;

rabbi

a Hebrew title of respect for a Jewish scholar or teacher ; spiritual leader of a Jewish congregation; qualified to expound and apply Jewish law ;

rabbi moses ben maimon

Spanish philosopher considered the greatest Jewish scholar of the Middle Ages who codified Jewish law in the Talmud (1135-1204) ;

rabbinate

the office or function of a rabbi ; rabbis collectively ;

rabbit

any of various burrowing animals of the family Leporidae having long ears and short tails; some domesticated and raised for pets or food ; flesh of any of various rabbits or hares (wild or domesticated) eaten as food ; the fur of a rabbit ;

rabbit's-foot fern

tropical American fern with brown scaly rhizomes cultivated for its large deeply lobed deep bluish-green fronds; sometimes placed in genus Polypodium ;

rabbit-eared bandicoot

bandicoot with leathery ears like a rabbit ;

rabbit-eye blueberry

shrub of southeastern United States grown commercially especially for canning industry ;

rabbit-weed

low-growing sticky subshrub of southwestern United States having narrow linear leaves on many slender branches and hundreds of tiny yellow flower heads ;

rabbit bandicoot

bandicoot with leathery ears like a rabbit ;

rabbit brush

pleasantly aromatic shrub having erect slender flexible hairy branches and dense clusters of small yellow flowers covering vast areas of western alkali plains and affording a retreat for jackrabbits; source of a yellow dye used by the Navajo ;

rabbit burrow

a hole in the ground as a nest made by wild rabbits ;

rabbit bush

pleasantly aromatic shrub having erect slender flexible hairy branches and dense clusters of small yellow flowers covering vast areas of western alkali plains and affording a retreat for jackrabbits; source of a yellow dye used by the Navajo ;

rabbit ears

an indoor TV antenna; consists of two extendible rods that form a V ;

rabbit fever

a highly infectious disease of rodents (especially rabbits and squirrels) and sometimes transmitted to humans by ticks or flies or by handling infected animals ;

rabbit food

an uncooked vegetable ;

rabbit hole

a hole in the ground as a nest made by wild rabbits ;

rabbit hutch

a hutch for rabbits ;

rabbit punch

a short chopping blow to the back of the neck ;

rabbit test

pregnancy test that involves injecting some of the woman's urine into an unmated female rabbit and later examining the ovaries of the rabbit; presence of corpora lutea indicates that the woman is pregnant ;

rabbit warren

an overcrowded residential area ; a series of connected underground tunnels occupied by rabbits ;

rabbiteye

shrub of southeastern United States grown commercially especially for canning industry ;

rabbiteye blueberry

shrub of southeastern United States grown commercially especially for canning industry ;

rabbitfish

large European chimaera ;

rabbitweed

low-growing sticky subshrub of southwestern United States having narrow linear leaves on many slender branches and hundreds of tiny yellow flower heads ;

rabbitwood

shrub of southeastern United States parasitic on roots of hemlocks having sparse spikes of greenish flowers and pulpy drupes ;

rabble

a disorderly crowd of people ; disparaging terms for the common people ;

rabble-rouser

an orator who appeals to the passions and prejudices of his audience ;