2. causal, making one breathe freely, relieving oppression of the breath, “λουτρόν” Hp.Acut.66.
II. affording a free passage to the air, “μυκτῆρες” X.Eq.1.10 (Comp.); ὁ [περὶ τὴν κεφαλὴν] τόπος εὔ. Arist.PA653b2, cf. 673b23 (Sup.); “κάλαμοι” Longus 2.35; “νεφέλαι εὔ. αὔραις” Orph.H.21.6.
2. open to the winds, airy, “οἰκία εὔπνους μὲν τοῦ θέρους, εὐήλιος δὲ τοῦ χειμῶνος” Arist.Oec.1345a31; “τόποι” Id.Pr.869a34 (Comp.); “δένδρα” Thphr.CP1.15.4; “τὸ εὔ. τοῦ τόπου” Pl.Phdr.230c.
III. good to breathe, fresh and pure, of the air, Thphr.CP1.13.8, Str.3.2.13: Comp. εὐπνοώτερος X.l.c., Hp. Epid.4.26; also εὐπνούστερος ib.7.39, Arist.Pr.960b22, Gal.5.911: Sup. -ούστατος Arist.PA673b23.