Webster’s Revised Unabridged Dictionary · 1913
Itaconic
It′a·con′ic (ĭt′ȧ·kŏn′ĭk), a. [From aconitic, by transposition of the letters.] (Chem.) Pertaining to, or designating, an acid, C5H6O4, which is obtained as a white crystalline substance by decomposing aconitic and other organic acids.