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Adjective: ethereal  i'theer-ee-ul
  1. Characterized by lightness and insubstantiality; as impalpable or intangible as air
    "physical rather than ethereal forms";
    - aeriform, aerial, airy, aery
     
  2. (chemistry) of, containing or dissolved in ether
    "ethereal solution"
     
  3. Of heaven or the spirit
    "ethereal melodies";
    - celestial, supernal
     
  4. Characterized by unusual lightness and delicacy
    "this smallest and most ethereal of birds";
    - gossamer

See also: delicate, heavenly, insubstantial, unreal, unsubstantial

Encyclopedia: Ethereal