Crossword clues for the word: GUAIACUM The word GUAIACUM has appeared as an answer to at least 2 crossword clues on different crossword puzzles. Crossword clues for GUAIACUM Showing 1 to 2 of 2 results Clue(s) Genus of tropical American evergreen trees also called lignum vitae Tropical tree: a copper is behind one in American Pacific island