Etymology
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succedaneum (n.)

"substitute," 1640s, from neuter of Latin succedaneus "succeeding, acting as substitute" (see succeed). Especially of inferior drugs substituted for better ones. Related: Succedaneous.

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Definitions of succedaneum

succedaneum (n.)
(medicine) something that can be used as a substitute (especially any medicine that may be taken in place of another);
From wordnet.princeton.edu