Definition of "Ethereal" :

adjective: characterized by lightness and insubstantiality; as impalpable or intangible as air

"Physical rather than ethereal forms."

adjective: characterized by unusual lightness and delicacy

"This smallest and most ethereal of birds."

adjective: of heaven or the spirit

"Ethereal melodies."

adjective: of or containing or dissolved in ether

"Ethereal solution."