Succedaneum n. (pl. succedanea) 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."
... audience caught them, and hissed her more than once: she herself once turned and hissed again—Tit pro tat geminat phoy d'achamiesmeyn—among the treaties which a secretary of state has negotiated this summer, he has contracted for a succedaneum to the Mingotti. In short, there is a woman hired to sing when the other ... — The Letters of Horace Walpole, Volume 2 • Horace Walpole
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