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From The Collaborative International Dictionary of English v.0.48:
Quinic \Quin"ic\, a. [See Quinine, and cf. Kinic.] (Chem.) Pertaining to, derived from, or connected with, quinine and related compounds; specifically, designating a nonnitrogenous acid obtained from cinchona bark, coffee, beans, etc., as a white crystalline substance. [Written also chinic, kinic.] [1913 Webster]