\Suc`ce*da"ne*um\, n.; pl. {Succedanea}. [NL. See
{Succedaneous}.]
One who, or that which, succeeds to the place of another;
that which is used for something else; a substitute;
specifically (Med.), a remedy used as a substitute for
another.

      In lieu of me, you will have a very charming
      succedaneum, Lady Harriet Stanhope.      --Walpole.