Source : Webster's Revised Unabridged Dictionary (1913)

Luteolin \Lu"te*o*lin\, n. [From NL. Reseda luteola, fr. L.
   luteolus yellowish, fr. luteus: cf. F. lut['e]oline. See
   {Luteous}.] (Chem.)
   A yellow dyestuff obtained from the foliage of the dyer's
   broom ({Reseda luteola}).