Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Latin
Origin: , present pasticiple of radiare; RADIATE

radiant

adjective
     
ra‧di‧ant
1 full of happiness and love, in a way that shows in your face and makes you look attractive:
She looked radiant in a white silk dress.
radiant with
They were both radiant with happiness.
2 [only before noun] literary very bright:
a lovely day with clear blue skies and radiant sun
3 [only before noun] technicalTP radiant heat or energy is sent out in the form of waves
radiantly adverb:
She looked radiantly beautiful.

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