Crocin \Cro"cin\ (kr?"s?n), n. [Gr. ???? saffron.] (Chem.) (a) The coloring matter of Chinese yellow pods, the fruit of {Gardenia grandiflora}. --Watts. (b) A red powder (called also {polychroite}), which is made from the saffron ({Crocus sativus}). See {Polychroite}.