radiant

adjective

• 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 conspicuous:he praised her radiant self-confidence

• 2 [attributive] (of electromagnetic energy, especially heat) transmitted by radiation, rather than conduction or convection: plants convert the radiant energy of the sun into chemical energy
• (of an appliance) designed to emit radiant energy, especially for cooking or heating: a radiant heater

noun

• a point or object from which light or heat radiates, especially a heating element in an electric or gas heater: I sat down by my hissing gas fire—one of the radiants was missing
• Astronomy a radiant point: don’t assume that you should stare toward the radiant to see the most meteors