1. <botany> A genus of small, crooked trees, growing in tropical America.

2. The heart wood or the resin of the Guaiacum offinale or lignum-vitae, a large tree of the West Indies and Central America. It is much used in medicine.

Alternative forms: guaiac.

Origin: NL, fr. Sp. Guayaco, from native name in Hayti.

(01 Mar 1998)