What is "croconic"

Croconic \Cro*con"ic\ (kr?-k?n"?k), a. [Gr. ???? saffron.]

1. Of, pertaining to, or resembling saffron; having the color of saffron; as, croconic acid.

2. Pertaining to, or derived from, croconic acid.

   Croconic acid (Chem.), a yellow crystalline substance, C5O3(OH)2, obtained from potassium carboxide, rhodizonic acid, and various phenol and quinone derivatives of benzene, and forming yellow or orange colored salts.

a. Of or pertaining to croconic acid or its derivatives