Ethereal

a.	1.	Pertaining to the hypothetical upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere; celestial; as, ethereal space; ethereal regions. Go, heavenly guest, ethereal messenger. - Milton.
	2.	Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy, as form, manner, thought, etc. Vast chain of being, which from God began, Natures ethereal, human, angel, man. - Pope.
	3.	(Chem.) Pertaining to, derived from, or resembling, ether; as, ethereal salts. Ethereal oil (Chem.) See Essential oil, under Essential. Ethereal oil of wine (Chem.) a heavy, yellow, oily liquid consisting essentially of etherin, etherol, and ethyl sulphate. It is the oily residuum left after etherification. Called also heavy oil of wine (distinguished from oil of wine, or œnanthic ether). Ethereal salt (Chem.) a salt of some organic radical as a base; an ester.

Adj.	1.	ethereal - characterized by lightness and insubstantiality; as impalpable or intangible as air; "figures light and aeriform come unlooked for and melt away"- Thomas Carlyle; "aerial fancies"; "an airy apparition"; "physical rather than ethereal forms" Synonyms: aery, aeriform, aerial, airy
	2.	ethereal - of or containing or dissolved in ether; "ethereal solution"
	3.	ethereal - of heaven or the spirit; "celestial peace"; "ethereal melodies"; "the supernal happiness of a quiet death" Synonyms: supernal, celestial
	4.	ethereal - characterized by unusual lightness and delicacy; "this smallest and most ethereal of birds"; "gossamer shading through his playing" Synonyms: gossamer

Elysian, Olympian, adulterated, aerial, aeriform, aerodynamic, aerostatic, aery, air-built, airish, airlike, airy, alfresco, altitudinous, ascending, asomatous, aspiring, astral, atmospheric, attenuate, attenuated, beatific, beatified, blessed, bodiless, boyish, breezy, bubbly, celestial, chimeric, chimerical, cloud-born, cloud-built, cloud-woven, colossal, cut, decarnate, decarnated, delicate, diaphanous, dilute, diluted, discarnate, disembodied, dominating, downy, dreamlike, ectoplasmic, elevated, eminent, empyreal, empyrean, etheric, exalted, exposed, extramundane, extraterrestrial, fanciful, fatuitous, fatuous, feathery, filmy, fine, fine-drawn, finespun, flimsy, fluffy, foamy, fragile, frail, from on high, frothy, fuming, fumy, gaseous, gasified, gasiform, gaslike, gassy, gauzy, ghostish, ghostlike, ghostly, ghosty, girlish, glorified, gossamer, gossamery, gracile, haughty, heavenly, high, high-pitched, high-reaching, high-set, high-up, illusory, imaginary, immaterial, impalpable, imponderable, imponderous, in glory, incorporate, incorporeal, insubstantial, intangible, lacy, leger, light, light as air, lighter than vanity, lofty, mephitic, miasmal, miasmatic, miasmic, misty, monumental, mounting, mousse, nonmaterial, nonphysical, occult, open-air, otherworldly, outtopping, overlooking, overtopping, oxyacetylene, oxygenous, ozonic, papery, paradisaic, paradisal, paradisiac, paradisic, phantasmal, phantasmic, phantom, phantomic, phantomlike, pneumatic, prominent, psychic, rare, rarefied, reeking, reeky, roomy, shadowy, slender, slenderish, slight, slight-made, slim, slimmish, slinky, small, smoking, smoky, soaring, souffle, specterlike, spectral, spiring, spiritual, spirituous, steaming, steamy, steep, sublime, subtile, subtle, superlative, supernal, supernatural, svelte, sylphlike, tenuous, thin, thin-bodied, thin-set, thin-spun, thinned, thinned-out, thinnish, threadlike, topless, toplofty, topping, towering, towery, transcendental, transmundane, tropospheric, uncompact, uncompressed, unearthly, unembodied, unextended, unfleshly, unheavy, unphysical, unreal, unsubstantial, unworldly, uplifted, upreared, vague, vaporing, vaporish, vaporlike, vaporous, vapory, volatile, wasp-waisted, watered, watered-down, watery, weak, weightless, willowy, windy, wiredrawn, wispy, wraithlike, wraithy, yeasty