I. ˈrā-dē-ənt adjective
Date: 15th century
1.
a. : radiating rays or reflecting beams of light
b. : vividly bright and shining : glowing
2. : marked by or expressive of love, confidence, or happiness
a radiant smile
3.
a. : emitted or transmitted by radiation
b. : emitting or relating to radiant heat
Synonyms: see bright
• ra·di·ant·ly adverb
II. noun
Date: circa 1741
: something that radiates: as
a. : a point in the heavens at which the visible paths of meteors appear to meet when traced backward
b. : the part of a gas or electric heater that becomes incandescent