Definition of "guaiac" [gua•iac]

• Variant of guaiacum. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "A newer version called immunochemical FOBT iFOBT is supposed to zero in on colon growths better than an older version known as guaiac FOBT -- which often picked up bleeding originating in the upper digestive tract, such as from a stomach ulcer."
• "It's a combination of frankincense, grapefruit and guaiac itself."
• "Physical examination revealed a well-appearing young woman, blood pressure 210/140 mm Hg in both arms, fundoscopic exam was normal, lungs were clear, cardiac exam revealed II/VI systolic ejection murmur, abdomen was nontender without hepatosplenomegaly, stool was guaiac negative, neurologic and musculoskeletal exams were normal."