-guaiacum-

n. [ NL., fr. Sp. guayaco, from native name in Haiti. ] 1. (Bot.) A genus of small, crooked trees, growing in tropical America. [ 1913 Webster ]

2. The heart wood or the resin of the Guaiacum officinale or lignum-vitæ, a large tree of the West Indies and Central America. It is much used in medicine. [ Written also guaiac. ] [ 1913 Webster ]