Source : Webster's Revised Unabridged Dictionary (1913)

Amurcous \A*mur"cous\, a. [LL. amurcosus, L. amurca the dregs of
   olives, Gr. 'amo`rghs, fr. 'ame`rgein to pluck.]
   Full off dregs; foul. [R.] --Knowles.