Meaning of ether

Definition of ether

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

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

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

a colorless volatile highly flammable liquid formerly used as an inhalation anesthetic

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