1. (Med.) Of or pertaining to purpura. Dunglison. [ 1913 Webster ]
2. (Chem.) Pertaining to or designating, a nitrogenous acid contained in uric acid. It is not known in the pure state, but forms well-known purple-red compounds (as murexide), whence its name. [ 1913 Webster ]
☞ Purpuric acid was formerly used to designate murexan. See Murexan. [ 1913 Webster ]