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racism the opinion or belief that a particular race of people is better than another race or races. [2 definitions]
rack1 a frame or stand used to hold, hang, or show things. [3 definitions]
racket1 a loud, confusing noise. [2 definitions]
racket2 an object used to hit the ball in tennis and similar sports. It is made of a round or oval frame with a network of tightly laced strings and a long handle.
racquetball a game played by two or four players in a small court with four walls. The players use rackets to hit a rubber ball against the walls.
radar the use of radio waves to track the location, distance, and speed of faraway objects. Waves are sent out and then picked up again when they bounce back after hitting some object. [2 definitions]
radiant sending out heat or rays of light; shining brightly. [2 definitions]
radiate to come out in the form of rays or waves. [4 definitions]
radiation the waves of energy sent out by sources of heat or light, or by radioactive material.
radiator a device that uses steam or hot water passing through pipes in order to heat a room. [2 definitions]
radical having to do with the root or source; basic; fundamental. [4 definitions]
radii a plural of radius.
radio a way of sending signals made of waves that travel through the air. These radio waves are picked up and translated into sounds by electronic devices. [3 definitions]
radioactive giving off energy as a result of the decay of unstable atoms.
radioactivity the giving off of energy as a result of the decay of unstable atoms.
radish a plant that has a crisp and strong-tasting root. [2 definitions]
radium a silver-white, radioactive metal that is one of the chemical elements. Radium glows in the dark. It is used to treat cancer. (symbol: Ra)
radius a straight line from the center to the edge of a circle or sphere. [2 definitions]
radon a radioactive gas that is one of the chemical elements. It is found in small amounts in some soils and rocks. (symbol: Rn)
raffle a game in which the person who has bought the ticket that is drawn wins a prize. [2 definitions]
raft1 a flat platform made of materials that can float, such as wood or barrels filled with air. Rafts are often used to carry people or goods. [3 definitions]