Pronunciation: (gwī'u-kum), [key]
1. any of several tropical American trees or shrubs belonging to the genus Guaiacum of the caltrop family; lignum vitae.
2. the hard, heavy wood of such a tree; guaiac.
3. resin obtained from such a tree; guaiac.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.