/ ˈreɪdiənt; NAmE / adjective
1.
radiant (with sth) showing great happiness, love or health :
a radiant smile
The bride looked radiant.
She was radiant with health.
2.
giving a warm bright light :
The sun was radiant in a clear blue sky.
3.
[ only before noun ] ( technical ) sent out in rays from a central point :
the radiant heat / energy of the sun
► ra·di·ant·ly adverb :
radiantly happy
He smiled radiantly.
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WORD ORIGIN
late Middle English : from Latin radiant- emitting rays, from the verb radiare , from radius ray, spoke.