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From The Collaborative International Dictionary of English v.0.48:
Kynurenic \Ky`nu*ren"ic\, a. [Gr. ?, ?, dog + ? urine.] (Physiol. Chem.) Pertaining to, or designating, an acid obtained from the urine of dogs. By decomposition the acid yields a nitrogenous base (called kynurin) and carbonic acid. [Written also cynurenic.] [1913 Webster]