1. A colorless liquid historically used as an anesthetic and which is highly flammable: "The nurse in the hospital applied ether to the patient so he would appear to be asleep and not feel pain or discomfort during the medical treatment".
2. A gas filled space in the sky beyond the earth's atmosphere and other celestial bodies; the heavens: "The astronomer used the telescope to peer through the ether, or skies surrounding the moon, in an attempt to see the mountains and valleys."

A chemical compound used in shampoos, bubble baths, body wash, and liquid soaps.