radiometer

meter to detect and measure radiant energy (electromagnetic or acoustic) ;

radiomicrometer

radiometer that is extremely sensitive ;

radiopacity

opacity to X-rays or other radiation ;

radiopaque dye

dye that does not allow the passage of X rays or other radiation; used to outline certain organs during X-ray examination ;

radiopharmaceutical

pharmaceutical consisting of a radioactive compound used in radiation therapy ;

radiophone

a telephone that communicates by radio waves rather than along cables ;

radiophoto

a photograph transmitted by radio waves ;

radiophotograph

a photograph transmitted by radio waves ;

radiophotography

transmission of photographs by radio waves ;

radioprotection

protection against harmful effects of radiation ;

radioscopy

(radiology) examination of the inner structure of opaque objects using X rays or other penetrating radiation ;

radiosensitivity

sensitivity to the action of radiant energy ;

radiotelegraph

the use of radio to send telegraphic messages (usually by Morse code) ; telegraphy that uses transmission by radio rather than by wire ;

radiotelegraphic signal

a signal transmitted by telegraphy ;

radiotelegraphy

the use of radio to send telegraphic messages (usually by Morse code) ; telegraphy that uses transmission by radio rather than by wire ;

radiotelephone

a telephone that communicates by radio waves rather than along cables ; telephony that uses transmission by radio rather than by wire ;

radiotelephony

telephony that uses transmission by radio rather than by wire ;

radiotherapist

a medical specialist who uses radioactive substances and X-rays in the treatment of disease ;

radiotherapy

(medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance ;

radiotherapy equipment

equipment used to treat diseases with x-rays or radioactivity ;

radiothorium

radioactive isotope of thorium with mass number 228 ;

radish

pungent fleshy edible root ; a cruciferous plant of the genus Raphanus having a pungent edible root ; Eurasian plant widely cultivated for its edible pungent root usually eaten raw ; pungent edible root of any of various cultivated radish plants ; radish of Japan with a long hard durable root eaten raw or cooked ;

radish plant

a cruciferous plant of the genus Raphanus having a pungent edible root ;

radium

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

radium therapy

the use of radium in radiation therapy ;

radius

support consisting of a radial member of a wheel joining the hub to the rim ; the length of a line segment between the center and circumference of a circle or sphere ; the outer and slightly shorter of the two bones of the human forearm ; a circular region whose area is indicated by the length of its radius; "they located it within a radius of 2 miles" ; a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere) ;

radius of curvature

the radius of the circle of curvature; the absolute value of the reciprocal of the curvature of a curve at a given point ;

radius vector

a line connecting a point in space to the origin of a polar coordinate system ; a line connecting a satellite to the center of the body around which it is rotating ;

radix

(numeration system) the positive integer that is equivalent to one in the next higher counting place; "10 is the radix of the decimal system" ;

radome

a housing for a radar antenna; transparent to radio waves ;

radon

a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health ;

radyera

very small species of shrubs of southern hemisphere: bush hibiscus ;

radyera farragei

southern and western Australian shrub with unlobed or shallowly lobed toothed leaves and purple flowers; sometimes placed in genus Hibiscus ;

raetam

desert shrub of Syria and Arabia having small white flowers; constitutes the juniper of the Old Testament; sometimes placed in genus Genista ;

raf

a Marxist and Maoist terrorist organization in Germany; a network of underground guerillas who committed acts of violence in the service of the class struggle; a successor to the Baader-Meinhof Gang; became one of Europe's most feared terrorist groups; disbanded in 1998 ; the airforce of Great Britain ;

raffaello santi

Italian painter whose many paintings exemplify the ideals of the High Renaissance (1483-1520) ;

raffaello sanzio

Italian painter whose many paintings exemplify the ideals of the High Renaissance (1483-1520) ;

raffia

feather palm of tropical Africa and Madagascar and Central and South America widely grown for commercial purposes ; fiber of a raffia palm used as light cordage and in making hats and baskets ; leaf fibers of the raffia palm tree; used to make baskets and mats etc. ;

raffia farinifera

a large feather palm of Africa and Madagascar having very long pinnatisect fronds yielding a strong commercially important fiber from its leafstalks ;

raffia palm

a large feather palm of Africa and Madagascar having very long pinnatisect fronds yielding a strong commercially important fiber from its leafstalks ;