The Collaborative International Dictionary of English v.0.48:

Erythroleic \Er`y*thro"le*ic\, a. [Gr. 'eryqro`s red + L. oleum
   oil.] (Chem.)
   Having a red color and oily appearance; -- applied to a
   purple semifluid substance said to be obtained from archil.
   [1913 Webster]