Webster's Revised Unabridged Dictionary · 1913

Empyreal

Empyreal , adjective

[Latin empyrius, empyreus, fiery, Greek {not transcribed}, {not transcribed}, in fire, fiery; {not transcribed} in + {not transcribed} fire. See In, and Fire.]

Formed of pure fire or light; refined beyond aerial substance; pertaining to the highest and purest region of heaven.
Go, soar with Plato to the empyreal sphere. — Pope
Collocations (1)
Empyreal air , oxygen gas.

Empyreal , noun

Empyrean. — Mrs. Browning