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Webster 1913 Edition

Adj.

[L.

aethereus

, Gr. [GREEK] See

Formed of ether; ethereal.

[Obs.]

This

ethereous

mold whereon we stand.

Milton.

(Chem.)

Pertaining to, or resembling, ether.

Ethereous oil

See

Ethereal oil

, under

Adj.

Formed of ether; heavenly.

ethereous ‎(comparative more ethereous, superlative most ethereous)

(obsolete) Formed of ether; ethereal.
This ethereous mould whereon we stand. — Milton.
(obsolete, chemistry) Of or resembling ether.