What is "pyroleic"

Sebacic \Se*bac"ic\, a. [L. sebum tallow: cf. F. s['e]bacique.] (Chem.) Of or pertaining to fat; derived from, or resembling, fat; specifically, designating an acid (formerly called also sebic, and pyroleic, acid), obtained by the distillation or saponification of certain oils (as castor oil) as a white crystalline substance.