The Collaborative International Dictionary of English v.0.48:

Peptohydrochloric \Pep`to*hy`dro*chlo"ric\, a. [See Peptone,
   and Hydrochloric.] (Physiol. Chem.)
   Designating a hypothetical acid (called peptohydrochloric
   acid, pepsinhydrochloric acid, and chloropeptic acid) which
   is supposed to be formed when pepsin and dilute (0.1-0.4 per
   cent) hydrochloric acid are mixed together. [Archaic]
   [1913 Webster]