n.

1. 【化】乙醚；醚[U]
2. 【物】以太[the S]
3. 太空，苍穹[the S]

n.

1. (also diethyl ether) a pleasant-smelling, volatile, highly flammable liquid used as an anaesthetic and as a solvent.
2. Chemistry  any organic compound with an oxygen atom linking two alkyl groups.
3. (also aether) chiefly literary the clear sky; the upper regions of air beyond the clouds.
4. (also aether) Physics,  historical a substance formerly postulated to permeate all space and to transmit light.