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From The Collaborative International Dictionary of English v.0.48:
Undecolic \Un`de*col"ic\, a. [Undecylenic + propiolic.] (Chem.) Pertaining to, or designating, an acid, C11H18O2, of the propiolic acid series, obtained indirectly from undecylenic acid as a white crystalline substance. [1913 Webster]