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[Etε: r]. Aether borrowed from classical Latin / Ancient Greek Αἰθήρ/ Aithếr / from αἴθω / aíthô  "burn" / spiritus aethereus / aithêr (« Pure Air, Aether ») (Encyclop. and Encyclop. Brit., Sv ether).

II.− [Speaking of a chemically defined body]

[CHEMISTRY] Very volatile spirit obtained by distilling a mixed acid with alcohol.

[MEDICINE] colourless liquid with a characteristic odour, used in industry as a solvent and in medicine as an antispasmodic, antiseptic and anaesthetic.

 In particular. (Ether used as a narcotic) You will need some preparation, that is to say a certain habit, to feel in all their completeness the singular effects of ether (...) different from the effects of hashish, the effects of opium and morphine (Guy Maupassant. Tales and news., vol. 2, Dreams, 1882). Compound. Addicted to ether, substitute. Masculine. Whoever makes use of ether as a narcotic. « A veritable atmosphere of mass hysteria amongst epileptics and ether addicts » (Huysmans, Là-bas, t. 2, 1891)