cinchonicadj./sɪŋˈkɒnɪk/ of or pertaining to cinchona, as in cinchonic acid, C11H14O9, obtained from cinchona; formerly applied to quinicadj. acid; cinchonic red = cinchona red.
ΚΠ
1837 Penny Cycl. VII. 174/1 Slightly soluble red colouring matter or red cinchonic acid.
1858 R. HoggVeg. Kingdom 407 Kinic Acid, or, as it is sometimes called, Cinchonic and Quinic Acid, is generally in the form of a thick syrupy liquid.