GUAIACUM

noun Etymology: New Latin, from Spanish guayaco, from Taino guayacan Date: 1553 any of a genus ( Guaiacum ) of the caltrop family of tropical American evergreen trees and shrubs having pinnate leaves, usually blue flowers, and capsular fruit, 2. the hard greenish-brown wood of a ~ (especially Guaiacum officinale ), a resin with a faint balsamic odor that is obtained from the trunk of two ~s ( G. officinale and G. sanctum ) and often used as a clinical reagent