15-letter words starting with ra
- racial minority — a group of a certain race that are in the minority compared to a larger group, the rest of the population, etc
- rack-and-pinion — of or relating to a mechanism in which a rack engages a pinion: rack-and-pinion steering.
- radar astronomy — the branch of astronomy that uses radar to map the surfaces of planetary bodies, as the moon and Venus, and to determine periods of rotation.
- radar telescope — (in radar astronomy) a very large radar antenna used to study planetary bodies in the solar system.
- radial symmetry — a basic body plan in which the organism can be divided into similar halves by passing a plane at any angle along a central axis, characteristic of sessile and bottom-dwelling animals, as the sea anemone and starfish.
- radial velocity — the component of the motion of a star away from or toward the earth along its line of sight, expressed in miles or kilometers per second and determined by the shift in the wavelength of light emitted by the star.
- radiant heating — the means of heating objects or persons by radiation in which the intervening air is not heated.
- radiator grille — a grille in an automobile or the like for air cooling of the liquid in the cooling system.
- radio announcer — someone who broadcasts or presents radio programmes
- radio astronomy — the branch of astronomy that utilizes extraterrestrial radiation in radio wavelengths rather than visible light for the study of the universe.
- radio broadcast — sth transmitted via radio signal
- radio frequency — the frequency of the transmitting waves of a given radio message or broadcast.
- radio programme — something that is broadcast on radio
- radio sono-buoy — a buoy equipped to detect underwater noises and transmit them by radio
- radio telephone — A radio telephone is a telephone which carries sound by sending radio signals rather than by using wires. Radio telephones are often used in cars.
- radio telescope — a system consisting of an antenna, either parabolic or dipolar, used to gather radio waves emitted by celestial sources and bring them to a receiver placed in the focus.
- radio-telephone — a telephone in which sound or speech is transmitted by means of radio waves instead of through wires or cables.
- radioautography — autoradiography.
- radiochemically — by radiochemical means or methods; from a radiochemical perspective
- radiogoniometer — a device used to detect the direction of radio waves, consisting of a coil that is free to rotate within two fixed coils at right angles to each other
- radiogoniometry — the science of detecting the direction of radio waves
- radioimmunology — the study of biological substances or processes with the aid of antigens or antibodies labeled with a radioactive isotope.
- radiometrically — using a radiometric method, in terms of radiometry
- radiomicrometer — an instrument for measuring small amounts of radiant energy, consisting of a sensitive thermocouple connected to a galvanometer.
- radiophosphorus — phosphorus 32.
- radiophotograph — a photograph or other image transmitted by radio.
- radioprotection — protection against radiation
- radioprotective — giving protection against the effects of radiation
- radiosensitizer — a substance, as a drug, that enhances the sensitivity of tissues or cells to radiation therapy.
- radiotechnology — the technical application of any form of radiation to industry.
- radiotelegraphy — the constructing or operating of radiotelegraphs.
- radiotelemetric — of or relating to radiotelemetry
- railway journey — a journey made by railway train
- railway network — a system of intersecting rail routes
- railway station — train stop, railroad station
- raise one's hat — to take one's hat briefly off one's head as a greeting or mark of respect
- raise the devil — Theology. (sometimes initial capital letter) the supreme spirit of evil; Satan. a subordinate evil spirit at enmity with God, and having power to afflict humans both with bodily disease and with spiritual corruption.
- rake's progress — a series of paintings and engravings by William Hogarth.
- ram-air turbine — a small air-driven turbine fitted to an aircraft to provide power in the event of a failure of the normal systems
- ramjet (engine) — a jet engine, without moving parts, in which the air for oxidizing the fuel is continuously compressed by being rammed into the inlet by the high velocity of the aircraft
- ramrod straight — having a very straight figure
- random sampling — a method of selecting a sample (random sample) from a statistical population in such a way that every possible sample that could be selected has a predetermined probability of being selected.
- random variable — a quantity that takes any of a set of values with specified probabilities.
- ranfurly shield — (in New Zealand) the premier rugby trophy, competed for annually by provincial teams
- range paralysis — Marek's disease.
- rape of lucrece — a narrative poem (1594) by Shakespeare.
- raster graphics — (graphics) Computer graphics in which an image is composed of an array of pixels arranged in rows and columns. Opposite: vector graphics.
- rat-tail cactus — a cactus, Aporocactus flagelliformis, of Mexico, having slim, cylindrical stems that are easily trained into strange designs, and crimson flowers.
- ratafia biscuit — a macaroon.
- rational number — a number that can be expressed exactly by a ratio of two integers.
On this page, we collect all 15-letter words starting with RA. It’s easy to find right word with a certain length. It is the easiest way to find 15-letter word that beginning with RA to use in Scrabble or Crossword puzzles.