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From The Collaborative International Dictionary of English v.0.48:
Xeronic \Xe*ron"ic\, a. [Gr. xhro`s dry + citraconic.] (Chem.) Pertaining to, or designating, an acid, C8H12O4, related to fumaric acid, and obtained from citraconic acid as an oily substance having a bittersweet taste; -- so called from its tendency to form its anhydride. [1913 Webster]