guayacan noun 9forms 1 noun9 •Any of various trees of Latin America which typically have strong, hard wood. •in genus Guaiacum (lignum vitae) •in genus Tabebuia •in genus Handroanthus •in species Libidibia paraguariensis (syn. Caesalpinia melanocarpa), of Argentina •in species Pseudalbizzia pistaciifolia, of Colombia •in species Centrolobium yavizanum, of Colombia •in species Minquartia guianensis, of Ecuador •in species Porlieria chilensis, of Chile formsguayacans