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guaiac

[ gwahy-ak ]
/ ˈgwaɪ æk /
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noun
Also called guaiacum gum, gum guaiac. a greenish-brown resin obtained from the guaiacum tree, especially from Guaiacum officinale, used in varnishes, as a food preservative, and in medicine in various tests for the presence of blood.
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Origin of guaiac

First recorded in 1550–60; see origin at guaiacum
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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