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Definition of Guaifenesin
1. Noun. Glyceryl guaiacolate, an expectorant drug used to assist the expectoration of phlegm from the airways in acute respiratory tract infections. ¹
¹ Source: wiktionary.com
Medical Definition of Guaifenesin
1. 3-(o-Methoxyphenoxy)-1,2-propanediol;an expectorant that reduces the viscosity of sputum. Synonym: glyceryl guaiacolate, guaiacol glyceryl ether. (05 Mar 2000)