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radar a means of discovering the position, range, and velocity of distant objects by timing the return of high frequency radio waves bounced off their surfaces and analyzing the direction of this return. [2 definitions]
radar beacon a device at a fixed location that emits radar waves, often only when activated by a specific radar pulse.
radarscope a monitor on which radar signals are viewed.
radial of or pertaining to a radius. [7 definitions]
radial engine an internal combustion engine in which the cylinders are arranged around a central shaft, formerly used to power propeller-driven aircraft.
radial saw a power tool consisting of a circular saw suspended from a pivoted horizontal arm; radial arm saw.
radial tire a tire with ply cords at right angles to the center line of the tread.
radiance the quality of being radiant or bright. [2 definitions]
radiant emitting heat or rays of light. [3 definitions]
radiant energy energy transmitted by waves, such as electromagnetic radiation or heat.
radiant flux the rate at which radiant energy such as heat or light flows through a given area.
radiate to send out rays, as of heat or electromagnetic radiation. [7 definitions]
radiation the emission of particles or waves of energy, as by radioactive material or by electrical circuits or devices. [3 definitions]
radiationless combined form of radiation.
radiation sickness sickness induced by overexposure to ionizing radiation such as x-rays or gamma rays, resulting in nausea, diarrhea, bleeding, hair loss, sterility, and often death.
radiator a device, such as that in a car, consisting of tubes through which fluid coolant passes. [3 definitions]
radical of or relating to roots, origins, or fundamental characteristics; basic. [6 definitions]
radicalism the advocacy of radical political or social changes. [2 definitions]
radicalize to make or become radical, esp. in political or social ideas.
radical sign a mathematical sign placed before a quantity to indicate extraction of its root.
radicand in mathematics, the number, variable, or quantity under a radical sign.