showing great happiness, love or health 喜气洋洋的；容光焕发的；面色红润的 a radiant smile 喜气洋洋的微笑 The bride looked radiant. 新娘看上去满面春风。 - radiant with something
She was radiant with health. 她身体健康，容光焕发。
giving a warm bright light 灿烂的；光芒四射的 - [only before noun] (specialist)
sent out in rays from a central point 辐射的；放射的 the radiant heat/energy of the sun 太阳的辐射热／辐射能
Word Originlate Middle English: from Latin radiant- ‘emitting rays’, from the verb radiare, from radius ‘ray, spoke’.