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.
Purpuric acid was formerly used to designate murexan. See Murexan.
Pur"pu*rin (?), n. (Chem.) A dyestuff resembling alizarin, found in
madder root, and extracted as an orange or red crystalline substance.
Pur`pu*rip"a*rous (?), a. [L. purpura purple + parere to produce.]
(Biol.) Producing, or connected with, a purple-colored secretion; as,
the purpuriparous gland of certain gastropods.
Pur`pu*rog"e*nous (?), a. [L. purpura purple + -genous.] (Biol.) Having
the power to produce a purple color; as, the purpurogenous membrane, or
choroidal epithelium, of the eye. See Visual purple, under Visual.
Purr (?), v. i. & t. To murmur as a cat. See Pur.
Purr, n. The low murmuring sound made by a cat; pur. See Pur.