12-letter words containing r, a, d, o
- quadraphonic — of, noting, or pertaining to the recording and reproduction of sound over four separate transmission or direct reproduction channels instead of the customary two of the stereo system: a quadraphonic recording.
- quadrillions — Plural form of quadrillion.
- quadrinomial — consisting of four terms.
- quadriphonic — quadraphonic.
- quadrisonics — quadraphony.
- quadrominium — a building consisting of four individually owned apartments or living units.
- quadrophonic — Alternative spelling of quadraphonic.
- quadrumanous — four-handed; having all four feet adapted for use as hands, as monkeys.
- quai d'orsay — the quay along the south bank of the Seine in Paris, on which are located the Ministry of Foreign Affairs and other French government offices.
- quinacridone — Any of a group of synthetic organic compounds whose molecules contain three benzene and two pyridine rings arranged alternately. They include a number of red to violet pigments.
- radar beacon — a radar device at a fixed location that, on receiving a radar signal, automatically transmits a particular radar signal in reply, identifying itself and enabling navigators of ships and aircraft to determine their distance and direction from it.
- radar sensor — a sensor on equipment used in radar, a method for detecting the position and velocity of a distant object
- radiator cap — a cap in the opening of a device for cooling an internal-combustion engine, through which coolant liquid can be added
- radicicolous — living on the roots of plants
- radicivorous — feeding on the roots of plants
- 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.
- rainbow bird — an Australian bee-eater, Merops ornatus, with brightly coloured plumage. It feeds in flight and nests in sandy burrows
- rally around — to bring into order again; gather and organize or inspire anew: The general rallied his scattered army.
- randallstown — a city in N Maryland, near Baltimore.
- random error — an error that has a random distribution and can be attributed to chance.
- 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.
- ratchet down — If something ratchets down or is ratcheted down, it decreases by a fixed amount or degree, and seems unlikely to increase again.
- 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.
- read up (on) — to become well informed (about) by reading
- read-through — reading (def 1).
- readaptation — the act of adapting.
- reading book — a book for people who are learning to read, to help them become accustomed to looking at and understanding written words
- reading room — a room set aside for reading, as in a library or club.