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ethereal (adj.)

formerly also etherial, 1510s, "of the highest regions of the atmosphere," from ether + -ial; extended sense of "light, airy" is from 1590s. Figurative meaning "spirit-like, immaterial" is from 1640s. Related: Ethereally.

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Definitions of ethereal from WordNet

ethereal (adj.)
characterized by lightness and insubstantiality; as impalpable or intangible as air; "figures light and aeriform come unlooked for and melt away"- Thomas Carlyle;
physical rather than ethereal forms
Synonyms: aeriform / aerial / airy / aery
ethereal (adj.)
of or containing or dissolved in ether;
ethereal solution
ethereal (adj.)
of heaven or the spirit;
ethereal melodies
Synonyms: celestial / supernal
ethereal (adj.)
characterized by unusual lightness and delicacy;
this smallest and most ethereal of birds
Synonyms: gossamer
From wordnet.princeton.edu