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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]
rag1 a scrap or small piece of cloth. [2 definitions]
rag2 (informal) to tease or scold.
rage extreme anger; fury. [3 definitions]
ragged worn down into rags; torn. [4 definitions]
ragweed a weed that produces a large amount of pollen in the fall. Many people are allergic to ragweed.
raid a sudden, surprise attack. [3 definitions]