1.Definition: a colorless volatile highly flammable liquid formerly used as an inhalation anesthetic

Related Noun(s):ethoxyethane

Category: Objects

2.Definition: a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves

Related Noun(s):aether

Category: General

3.Definition: any of a class of organic compounds that have two hydrocarbon groups linked by an oxygen atom

Category: General

4.Definition: the fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies

Related Noun(s):quintessence

Category: General