1. chemistry liquid solvent: a volatile colorless liquid with a pleasant smell. Use: solvent, formerly as an anesthetic. C2H5OC2H5
2. (plurale·thers)chemistry organic compound with linked hydrocarbon groups: any organic compound containing two hydrocarbon groups linked by an oxygen atom
3. sky: the sky, or the upper reaches of the atmosphere
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4. air: Earth's atmosphere
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literary
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5. physics hypothetical electromagnetic medium: a medium formerly believed to fill the atmosphere and outer space and to carry electromagnetic waves send a message across the ether
