genus Guaiacum, Guaiacum - small genus of evergreen resinous trees or shrubs of warm and tropical America

guaiac, lignum vitae, guaiacum - hard greenish-brown wood of the lignum vitae tree and other trees of the genus Guaiacum

guaiacum - medicinal resin from the lignum vitae tree

angiospermous tree, flowering tree - any tree having seeds and ovules contained in the ovary