| ethene | (noun) a flammable colorless gaseous alkene; obtained from petroleum and natural gas and used in manufacturing many other chemicals; sometimes used as an anesthetic | Synonyms: ethylene |
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| ether | (noun) a colorless volatile highly flammable liquid formerly used as an inhalation anesthetic | Synonyms: diethyl ether, divinyl ether, ethoxyethane, ethyl ether, vinyl ether |
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| (noun) a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves | Synonyms: aether |
| (noun) any of a class of organic compounds that have two hydrocarbon groups linked by an oxygen atom | - |
| (noun) the fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies | Synonyms: quintessence |
| ethereal | (adjective) of or containing or dissolved in ether | - |
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| (adjective) characterized by unusual lightness and delicacy | Synonyms: gossamer |
| (adjective) of heaven or the spirit | Synonyms: celestial, supernal |
| (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aerial, aeriform, aery, airy |
| etherealize | (verb) make ethereal | Synonyms: etherialise |
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| etherialise | (verb) make ethereal | Synonyms: etherealize |
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| etherify | (verb) change into an ether | - |
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| etherise | (verb) anesthetize with ether | Synonyms: etherize |
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| etherize | (verb) anesthetize with ether | Synonyms: etherise |
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| ethernet | (noun) a type of network technology for local area networks; coaxial cable carries radio frequency signals between computers at a rate of 10 megabits per second | - |
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