Skip to Content


Pronunciation: gwi'ak

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]

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.