The Collaborative International Dictionary of English v.0.48:

Amphibological \Am*phib`o*log"ic*al\
   ([a^]m*f[i^]b`[-o]*l[o^]j"[i^]*kal), a.
   Of doubtful meaning; ambiguous. "Amphibological expressions."
   --Jer. Taylor.
   [1913 Webster] -- Am*phib`o*log"ic*al*ly, adv.
   [1913 Webster]