The Collaborative International Dictionary of English v.0.48:

Amphibolic \Am`phi*bol"ic\ ([a^]m`f[i^]*b[o^]l"[i^]c), a.
   1. Of or pertaining to amphiboly; ambiguous; equivocal.
      [1913 Webster]

   2. Of or resembling the mineral amphibole.
      [1913 Webster]