Source : Webster's Revised Unabridged Dictionary (1913)

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.