Granular material colored dark red-brown or mahogany that occurs in human feces in tropic regions; it yields a chemical reaction similar to that of urobilinogen and is composed of calcium oxide, iron, phosphoric and carbonic acids, urobilinogen, cholerythrogen, and other organic matter in varying proportions.
[Sp. wood dust under the bark of a tree, caused by the wood louse]
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Examples: glitazone, GI cocktail, etc.