ether

/'i:θə/
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ether

A scientist carefully pours ether into a beaker in the laboratory.

Definition
  1. Noun:
    • A colorless, volatile, highly flammable liquid formerly used as an inhalation anesthetic: A chemical compound with specific physical properties, historically used in medicine to induce unconsciousness for surgery.
    • A hypothetical medium once supposed to fill all space and support the propagation of electromagnetic waves: In historical physics, a theoretical, intangible substance thought to permeate the universe as a medium for light waves.
    • Any of a class of organic compounds characterized by an oxygen atom bonded to two alkyl or aryl groups: In chemistry, a functional group and a class of compounds, such as diethyl ether.
    • The fifth and highest classical element (after air, earth, fire, and water); believed to be the substance composing all heavenly bodies: In ancient and medieval cosmology and philosophy, a pure, celestial substance.
Usage Examples
  • Noun:
    • The surgeon administered ether to the patient before the operation. (Referring to the anesthetic.)
    • Nineteenth-century scientists postulated that light traveled through the luminiferous ether. (Referring to the theoretical medium.)
    • Diethyl ether is a common laboratory solvent. (Referring to the chemical compound.)
    • In Aristotle's cosmology, the stars were made of ether. (Referring to the classical element.)
Advanced Usage
  • "In the ether": Used figuratively to describe something intangible, abstract, or diffused in the atmosphere or realm of ideas.
    • Rumors about the merger are floating in the ether.
  • "Ethernet": A trademarked term for a system of connecting computers in a local area network. (Note: This is a compound/proper noun listed here as a related term, not as a definition of "ether" itself).
Variants and Related Words
  • Ethereal (adj): Extremely delicate, light, and heavenly; not of this world.
    • The music had an ethereal quality.
  • Etherize (v, rare): To administer ether as an anesthetic.
    • The doctor would etherize the patient.
Synonyms
  • Anesthetic: For the medical usage (e.g., chloroform).
  • Medium: For the physics usage (e.g., plenum).
  • Solvent: For the chemical usage (e.g., dimethyl ether).
  • Quintessence: For the classical element usage.
Related Phrases
  • Luminiferous ether: The specific historical term for the light-bearing medium in physics.
Related Idioms
  • Into the ether: Disappearing or being sent to an unknown or unreachable place.
    • My carefully written email seems to have vanished into the ether.
ether

A scientist carefully pours ether into a beaker in the laboratory.

Noun
  1. a colorless volatile highly inflammable liquid formerly used as an inhalation anesthetic
  2. a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves
  3. any of a class of organic compounds that have two hydrocarbon groups linked by an oxygen atom
  4. the fifth and highest element after air and earth and fire and water; was believed to be the substance composing all heavenly bodies

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