12-letter words containing a, r, i, d
- radiant flux — the time rate of flow of radiant energy.
- radiant heat — heat energy transmitted by electromagnetic waves in contrast to heat transmitted by conduction or convection.
- radiata pine — a pine tree, Pinus radiata, native to the western USA. but grown in Australia, New Zealand, and elsewhere to produce building timber
- radiator cap — a cap in the opening of a device for cooling an internal-combustion engine, through which coolant liquid can be added
- radical axis — the line such that tangents drawn from any point of the line to two given circles are equal in length.
- radical chic — the patronage of extremists or left-wing radicals by rich or famous people, as through invitations to social functions or public expressions of support.
- radical left — the faction representing extreme left-wing political views, often Marxist or Maoist in ideology.
- radical sign — the symbol √ or indicating extraction of a root of the quantity that follows it, as √25=5 or .
- radicicolous — living on the roots of plants
- radicivorous — feeding on the roots of plants
- radiesthesia — the ability to sense energy forces or radiation, esp from the human body
- radiesthetic — of or relating to radiesthesia
- radio beacon — a radio station that sends a characteristic signal so as to enable ships or airplanes to determine their position or bearing by means of a radio compass.
- radio galaxy — a galaxy that emits much more strongly in the radio part of the spectrum than does a typical galaxy.
- radio source — a cosmic object or phenomenon, as a galaxy, pulsar, quasar, or the remnant of a supernova or of a galactic collision, that emits radio waves.
- radio window — the range of wavelengths at which the earth's atmosphere is transparent to radio waves.
- radio-carbon — Also called carbon 14. a radioactive isotope of carbon with mass number 14 and a half-life of about 5730 years: widely used in the dating of organic materials.
- radio-collar — to attach a radio collar to (an animal).
- radiobiology — the branch of biology dealing with the effects of radiation on living matter.
- radioecology — the branch of ecology concerned with the effects of radioactivity on the environment
- radioelement — a radioactive element.
- radiographer — X-ray technician
- radioisotope — a radioactive isotope, usually artificially produced: used in physical and biological research, therapeutics, etc.
- radiolocator — radar.
- 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.
- ragged robin — a plant, Lychnis flos-cuculi, of the pink family, having pink or white flowers with dissected petals.
- railroad car — a railway carriage or van
- railroad pen — a ruling pen for drawing two parallel lines.
- 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
- 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
- rally driver — sports-car racer
- 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
- 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.
- rat-infested — (of a place or vessel) that has many rats
- rating badge — a badge that indicates the rank and specialty of a petty officer: worn on the upper left sleeve.
- raven-haired — with glossy deep black hair
- ravioli code — (jargon, humour) Object-oriented code consisting of a number of small and loosely-coupled software components. Presumably, the term is a compliment, contrasting the code with spaghetti code.
- re-admission — the act of allowing to enter; entrance granted by permission, by provision or existence of pecuniary means, or by the removal of obstacles: the admission of aliens into a country.
- re-educative — of or relating to re-education
- reaccredited — to ascribe or attribute to (usually followed by with): He was accredited with having said it.
- reacquainted — to make more or less familiar, aware, or conversant (usually followed by with): to acquaint the mayor with our plan.