Lewis Short
(adjective) : spīrābĭlis, e, spiro
* That may be breathed, good to breathe, breathable, respirable.
* Lit.: terra circumfusa undique est hac animali spirabilique naturā, cui nomen est aër,Cic. N. D. 2, 36, 91; cf. id. ib. 2, 6, 18; id. Tusc. 1, 17, 40; 1, 29, 70.
* Transf. *
* Pass., that serves to sustain life, vital: per sidera testor, caeli spirabile lumen,Verg. A. 3, 600.—*
* Act., that can breathe, fitted for breathing, respiratory: viscera,Plin. 9, 7, 6, § 17.
Charlton T. Lewis, Charles Short, A Latin Dictionary