Webster's Revised Unabridged Dictionary · 1913

Ethereous

Ethereous , adjective

[Latin aethereus, Greek {not transcribed} See Ether.]

1.
Formed of ether; ethereal. [Obsolete]
This ethereous mold whereon we stand. — Milton
2.
(Chemistry) Pertaining to, or resembling, ether.
Collocations (1)
Ethereous oil , See Ethereal oil, under Ethereal.