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Definition of radiant
1sending out light; shining or glowing brightly:a bird with radiant green and red plumage (of a person or their expression) clearly emanating great joy, love, or health:she gave him a radiant smile (of an emotion or quality) emanating powerfully from someone or something; very intense or conspicuous:he praised her radiant self-confidence 2 [attributive] (of heat) transmitted by radiation, rather than conduction or convection. (of an appliance) designed to emit radiant energy, especially for cooking or heating.
a point or object from which light or heat radiates, especially a heating element in an electric or gas heater.