guaiac

[gwahy-ak]
noun
  1. 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.
  2. guaiacum(def 2).

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. 2018

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Historical Examples of guaiac