[{"Bold_text": "noun", "List Items": ["Also calledguai·a·cum gum[gwahy, -, uh, -k, uh, m , guhm];.a greenish-brown resin obtained from the guaiacum , especially from Guaiacum officinale,used in varnishes, as a food preservative, and in medicine in various tests for the presence of blood.", "guaiacum(def2) guaiacum(def2)."]}]