Source : Webster's Revised Unabridged Dictionary (1913)

Respirable \Re*spir"a*ble\ (r?*sp?r"?*b'l or r?s"p?*r?*b'l), a.
   [Cf. F. respirable.]
   Suitable for being breathed; adapted for respiration. --
   {Re*spir"a*ble*ness}, n.