a.

1. 光芒四射的；明亮照耀的[B]
   the radiant sun

   光芒四射的太阳

2. 容光焕发的；（面容，目光）洋溢着幸福的[（+with）]
   His radiant face told us of his happiness.

   从他容光焕发的脸上，我们看出他很幸福。

3. 【物】发光的；发热的；辐射的[B]
   The sun is a radiant body.

   太阳是发光体。

n.

1. 发光（或发热）的物体，光点
2. （电炉等的）白炽部分
3. 【天】（流星雨）辐射点

adj.

1. shining or glowing brightly.
   ▸displaying great joy, love, or health.
   ▸(of an emotion or quality) very conspicuous.
2. transmitted by electromagnetic radiation, rather than conduction or convection.
   ▸(of an appliance) emitting radiant energy for cooking or heating.

n.

1. a point or object from which light or heat radiates.
2. Astronomy  the apparent focal point of a meteor shower.