Medical Definition of infusion
1a: the introducing of a solution (as of glucose or salt) especially into a vein; also : the solution so usedb (1): the steeping or soaking usually in water of a substance (as a plant drug) in order to extract its soluble constituents or principles—compare decoction 1 (2): the liquid extract obtained by this process
2: a watery suspension of decaying organic material <culturing soil amebas in lettuce infusion>
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