12-letter words starting with ra
- radiological — of or relating to radiology.
- radiolucency — almost entirely transparent to radiation; almost entirely invisible in x-ray photographs and under fluoroscopy.
- radiomimetic — (of drugs) producing effects similar to those produced by X-rays
- radionuclide — a radioactive nuclide.
- radiophonist — a person who produces radiophonic music
- radiotherapy — treatment of disease by means of x-rays or of radioactive substances.
- radiothorium — a disintegration product of thorium.
- rag business — the garment, clothing, or fashion industry.
- ragged robin — a plant, Lychnis flos-cuculi, of the pink family, having pink or white flowers with dissected petals.
- ragman rolls — Usually, ragman rolls. a series of documents in which the Scottish nobles acknowledged their allegiance to Edward I of England, 1291–92 and 1296.
- rail traffic — the vehicles, passengers, or freight that are moving from place to place by railway
- railroad car — a railway carriage or van
- railroad pen — a ruling pen for drawing two parallel lines.
- railway line — railroad route
- railway yard — an area having a network of railway tracks and sidings, used for storing rolling stock, making up trains, etc
- rainbow bird — an Australian bee-eater, Merops ornatus, with brightly coloured plumage. It feeds in flight and nests in sandy burrows
- rainbow fish — guppy.
- rainbow flag — a multicoloured flag used as a symbol of peace; often used to represent gay and lesbian pride
- rainbow roof — a gable roof in the form of a broad Gothic arch, with gently sloping convex surfaces.
- raised beach — a wave-cut platform raised above the shoreline by a relative fall in the water level
- raisin bread — dough baked with dried grapes
- raking piece — a sloping piece of scenery, as on a television or stage set, especially such a piece used for masking the side of a ramp.
- rally around — to bring into order again; gather and organize or inspire anew: The general rallied his scattered army.
- rally driver — sports-car racer
- rallying cry — A rallying cry or rallying call is something such as a word or phrase, an event, or a belief which encourages people to unite and to act in support of a particular group or idea.
- ram sth home — If something rams home a message or a point, it makes it clear in a way that is very forceful and that people are likely to listen to.
- raman effect — the change in wavelength of light scattered while passing through a transparent medium, the collection of new wavelengths (Raman spectrum) being characteristic of the scattering medium and differing from the fluorescent spectrum in being much less intense and in being unrelated to an absorption band of the medium.
- ramapithecus — a genus of extinct Miocene ape known from fossils found in India and Pakistan and formerly thought to be a possible human ancestor.
- rambunctious — difficult to control or handle; wildly boisterous: a rambunctious child.
- rambus, inc. — (company) The company which designed Rambus DRAM. Address: Mountain View, CA., USA.
- ramentaceous — resembling or covered with ramenta.
- ramification — the act or process of ramifying.
- rammed earth — a mixture of sand, loam, clay, and other ingredients rammed hard within forms as a building material.
- rammohun roy — Rammohun [rah-moh-hon] /rɑˈmoʊ hɒn/ (Show IPA), 1774–1833, Indian religious leader: founder of Brahmo Samaj.
- randallstown — a city in N Maryland, near Baltimore.
- random error — an error that has a random distribution and can be attributed to chance.
- range finder — any of various instruments for determining the distance from the observer to a particular object, as for sighting a gun or adjusting the focus of a camera.
- rangefinding — the act or process of determining the distance of an object from the observer
- ranging pole — a pole for marking positions in surveying
- ranjit singh — ("Lion of the Punjab") 1780–1839, Indian maharaja: founder of the Sikh kingdom of Punjab.
- raoult's law — the principle that the fraction by which the vapor pressure of a solvent is lowered by the addition of a nonvolatile, nonelectrolytic solute is equal to the mole fraction of the solute in the solution.
- rapacki plan — the denuclearization of Poland, Czechoslovakia, East Germany, and West Germany, proposed by Adam Rapacki (1909–70), the Polish foreign minister, in 1957
- rapeseed oil — a brownish-yellow oil obtained by expression from rapeseed and used chiefly as a lubricant, an illuminant, and in the manufacture of rubber substitutes.
- raphaelesque — of, relating to, or characteristic of the style of the painter Raphael.
- rappahannock — a river flowing SE from N Virginia into the Chesapeake Bay: Civil War battle 1863. 185 miles (300 km) long.
- rarity value — if something has rarity value, it is valuable because there a few examples of it
- rat kangaroo — any of several rabbit-sized, ratlike Australian kangaroos of the subfamily Potoroinae.
- rat-catching — the job of destroying or driving away vermin, esp rats
- rat-infested — (of a place or vessel) that has many rats
- rat-kangaroo — any of several rabbit-sized, ratlike Australian kangaroos of the subfamily Potoroinae.