1. • noun - the fifth and highest element after air and earth and fire and water
   • noun - any of a class of organic compounds that have two hydrocarbon groups linked by an oxygen atom
   • noun - a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves
   • noun - a colorless volatile highly inflammable liquid formerly used as an inhalation anesthetic
2. • Any of a class of organic compounds in which two hydrocarbon groups are linked by an oxygen atom.
   • A volatile, highly flammable liquid, C2H5OC2H5, derived from the distillation of ethyl alcohol with sulfuric acid and widely used as a reagent, a solvent, and an anesthetic.
   • The regions of space beyond the earth’s atmosphere; the heavens.
   • The element believed in ancient and medieval civilizations to fill all space above the sphere of the moon and to compose the stars and planets.
   • An all-pervading, infinitely elastic, massless medium formerly postulated as the medium of propagation of electromagnetic waves.
3. • adj - a volatile liquid used as an anesthetic [n -S] : ETHERIC

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