Guaiac

Part of speech: noun

Definitions

1. A resin obtained from the guaiacum tree used as a reagent in medical tests for detecting blood in stool samples ; a substance derived from certain tropical hardwoods employed in chemical assays ; a natural extract utilized in laboratory diagnostics to identify the presence of occult blood in bodily waste
2. A plant-based resin sourced from Guaiacum species, commonly applied in stool tests for hidden blood; a compound extracted from tropical trees functioning as a testing agent; a botanical derivative used in medical laboratory procedures to reveal concealed bleeding
3. A natural resin from guaiac wood used in testing for blood traces in feces ; a chemical obtained from specific hardwood trees involved in detection assays ; an organic extract employed in clinical testing to confirm the presence of blood in stool specimens

Etymology: Guaiac is the resin of the guaiacum tree, a dense hardwood native to the Caribbean and tropical America, and the name reaches English through Spanish from the Taíno-influenced Caribbean. The tree's wood was so hard and heavy that it was prized for ship blocks and was also used in the treatment of syphilis in the sixteenth century, when the wood and its resin were imported into Europe as a supposed cure. The "guaiacum" name appears in Spanish and Latin sources of the early 1500s, and "guaiac" is the shorter English form that came into use later. The resin is a useful chemical test. When guaiac resin is exposed to oxidizing agents in the presence of peroxidase-like activity, it turns blue, which is why it has long been used to detect hidden blood in stool and in forensic and laboratory settings. Its name thus connects a sixteenth-century medical import with a modern diagnostic reagent that still bears the tree's name.

Synonyms: guaiacum, wood resin, guaiac resin