The Collaborative International Dictionary of English v.0.48:

Inferable \In*fer"a*ble\ ([i^]n*f[~e]r"[.a]*b'l or
   [i^]n*f[e^]r"-; 277), a.
   Capable of being inferred or deduced from premises. [Written
   also inferrible.] --H. Spencer.
   [1913 Webster]

         A sufficient argument . . . is inferable from these
         premises.                                --Burke.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Inferrible \In*fer"ri*ble\, a.
   Inferable.
   [1913 Webster]