Ethereal vs. Ephemeral

Ethereal and Ephemeral Definitions
Ethereal
Extremely light or delicate
"An ant lion ... is lovely, long-bodied like a damselfly, with a pair of ethereal wings" (Jennifer Ackerman).
Ephemeral
Lasting for a markedly brief time
"There remain some truths too ephemeral to be captured in the cold pages of a court transcript" (Irving R. Kaufman).
Ethereal
Of the celestial spheres; heavenly.
Ephemeral
Having a short lifespan or a short annual period of aboveground growth. Used especially of plants.
Ethereal
Spiritual or otherworldly.
Ephemeral
Something, especially a plant, that is ephemeral.
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Ethereal
(Chemistry) Of or relating to ether.
Ephemeral
Something which lasts for a short period of time.
Ethereal
Pertaining to the (real or hypothetical) upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere.
Ethereal space
Ethereal regions
Ephemeral
Lasting for a short period of time.
Ethereal
Pertaining to the immaterial realm, as symbolically represented by, or (in earlier epochs) conflated with, such atmospheric and extra-atmospheric concepts.
Ephemeral
(biology) Existing for only one day, as with some flowers, insects, and diseases.
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Ethereal
Consisting of ether; hence, exceedingly light or airy; tenuous; spiritlike; characterized by extreme delicacy, as form, manner, thought, etc.
Ephemeral
Usually dry, but filling with water for brief periods during and after precipitation.
Ethereal
(organic chemistry) To do with diethyl ether.
An ethereal solution
Ephemeral
Beginning and ending in a day; existing only, or no longer than, a day; diurnal; as, an ephemeral flower.
Ethereal
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.
Ephemeral
Short-lived; existing or continuing for a short time only.
Sentences not of ephemeral, but of eternal, efficacy.
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Ethereal
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.
Ephemeral
Anything lasting but a day, or a brief time; an ephemeral plant, insect, etc.
Ethereal
Pertaining to, derived from, or resembling, ether; as, ethereal salts.
Ephemeral
Enduring a very short time;
The ephemeral joys of childhood
A passing fancy
Youth's transient beauty
Love is transitory but at is eternal
Fugacious blossoms
Ethereal
Characterized by lightness and insubstantiality; as impalpable or intangible as air;
Figures light and aeriform come unlooked for and melt away
Aerial fancies
An airy apparition
Physical rather than ethereal forms
Ethereal
Of or containing or dissolved in ether;
Ethereal solution
Ethereal
Of heaven or the spirit;
Celestial peace
Ethereal melodies
The supernal happiness of a quiet death
Ethereal
Characterized by unusual lightness and delicacy;
This smallest and most ethereal of birds
Gossamer shading through his playing