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]
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