Definition: The resin of Guaiacum officinale or G. sanctum (family Zygophyllaceae); a nauseant, diaphoretic, stimulant, and reagent used in testing for occult blood.
Synonym(s): guaiac gum
[Sp. guayaco, imitating the native Carib name]
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Examples: glitazone, GI cocktail, etc.