• synonyms


  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).
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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. 2018

Examples from the Web for guaiac

Historical Examples

  • Guaiac wood oil, distilled from the wood of Bulnesia sarmienti.

    The Handbook of Soap Manufacture

    W. H. Simmons

  • The principal constituent of the oil is guaiac alcohol, or gusiol.

  • Tincture of guaiac, diluted to a light sherry-wine color (keep in a dark-glass bottle).