guaiac

Noun

 * 1)  A paper treated with alpha-guaiaconic acid, used in tests to detect blood in the faeces.
 * 2) Guaiacum tree, wood or resin of the guaiacum tree
 * 3) Guaiacol.
 * 4) Oil of guaiac, a fragrance ingredient used in soap and perfumery distilled from the palo santo tree.