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 ]