'Empyreal air' definitions:

Definition of 'Empyreal air'

From: GCIDE

Empyreal \Em*pyr"e*al\, a. [L. empyrius, empyreus, fiery, Gr. ?, ?, in fire, fiery; ? in + ? fire. See In, and Fire.] Formed of pure fire or light; refined beyond a["e]rial substance; pertaining to the highest and purest region of heaven. [1913 Webster]
Go, soar with Plato to the empyreal sphere. --Pope. [1913 Webster]
Empyreal air, oxygen gas. [1913 Webster]