Webster’s Revised Unabridged Dictionary · 1913
Propiolic
Pro′pi·ol′ic (·ŏl′ĭk), a. [Propionic + tetrolic.] (Chem.) Pertaining to, or designating, an organic acid (called also propargylic acid) of the acetylene or tetrolic series, analogous to propionic acid, and obtained as a white crystalline substance.