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Postum (n.)

proper name of a coffee substitute, 1895, from a Latinized form of the name of American manufactured foods pioneer Charles William Post (1854-1914), founder of the breakfast cereal company.

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Definitions of Postum from WordNet

Postum (n.)
trade mark for a coffee substitute invented by C. W. Post and made with chicory and roasted grains;
From wordnet.princeton.edu