1. (noun) the fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies

• quintessence

2. (noun) a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves

• aether

3. (noun) a colorless volatile highly inflammable liquid formerly used as an inhalation anesthetic

• diethyl ether
• divinyl ether
• ethoxyethane
• ethyl ether
• vinyl ether

1. (noun) the fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies

• element

2. (noun) any of a class of organic compounds that have two hydrocarbon groups linked by an oxygen atom

• organic compound

3. (noun) a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves

• medium

4. (noun) a colorless volatile highly inflammable liquid formerly used as an inhalation anesthetic

• inhalation anaesthetic
• inhalation anesthetic
• inhalation general anaesthetic
• inhalation general anesthetic

1. (noun) a colorless volatile highly inflammable liquid formerly used as an inhalation anesthetic

• enflurane
• ethrane

1. (noun) the fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies

• celestial
• ethereal
• supernal
• quintessential

2. (noun) any of a class of organic compounds that have two hydrocarbon groups linked by an oxygen atom

• ethereal

3. (noun) a colorless volatile highly inflammable liquid formerly used as an inhalation anesthetic

• ethereal
• etherify
• etherise
• etherize