a.

1. 如空气般轻的；飘逸的；精致的；缥缈的
   She was describing an ethereal experience when she said she ran into a ghost. Thus, nobody believed her.

   当她说她看到鬼的时候，她在描述一个缥缈的经历，所以没有人相信她。

   ethereal music

   轻柔动听的音乐

2. 天上的；非人间的
   She has an ethereal beauty.

   她美若天仙。

   Her ethereal beauty conquered the heart of everyone she met.

   她天仙般的美丽让每个人臣服。

3. 【化】（乙）醚的
4. 【物】以太的

adj.

1. extremely delicate and light, in a way that seems not to be of this world.
2. Chemistry  (of a solution) having diethyl ether as a solvent.