n 1 : the act or process of boiling usu. in water so as to extract the flavor or active principle - compare INFUSION1b(1) 2 a : an extract or liquid preparation obtained by decocting b : a liquid preparation made by boiling a medicinal plant with water usu. in the proportion of 5 parts of the drug to 100 parts of water .
Published under license with Merriam-Webster, Incorporated. © 1997-2018.