WordReference Random House Learner's Dictionary of American English © 2017
e•the•re•al /ɪˈθɪriəl/USA pronunciation   adj. 
  1. light;
    extremely delicate: ethereal beauty.

WordReference Random House Unabridged Dictionary of American English © 2017
e•the•re•al  (i thērē əl),USA pronunciation adj. 
  1. light, airy, or tenuous:an ethereal world created through the poetic imagination.
  2. extremely delicate or refined:ethereal beauty.
  3. heavenly or celestial:gone to his ethereal home.
  4. of or pertaining to the upper regions of space.
  5. Chemistrypertaining to, containing, or resembling ethyl ether.
Also,  aethereal (for defs. 1–4). e•the′re•ali•ty, e•there•al•ness, n. 
e•there•al•ly, adv. 
e•there•ous, adj. 
  • Greek aithérios), equivalent. to aether- ether + -eus adjective, adjectival suffix + -al1
  • Latin aethere(us) (
  • 1505–15

Collins Concise English Dictionary © HarperCollins Publishers::

ethereal /ɪˈθɪərɪəl/ adj
  1. extremely delicate or refined; exquisite
  2. almost as light as air; impalpable; airy
  3. celestial or spiritual
  4. of, containing, or dissolved in an ether, esp diethyl ether: an ethereal solution
  5. of or relating to the ether
Etymology: 16th Century: from Latin aethereus, from Greek aitherios, from aithēr ether

eˌthereˈality, eˈtherealness n

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