n 1 a  :  the introducing of a solution (as of glucose or salt) esp. into a vein : also  :  the solution so used  b (1) :  the steeping or soaking usu. in water of a substance (as a plant drug) in order to extract its soluble constituents or principles - compare DECOCTION1   (2) :  the liquid extract obtained by this process  2  :  a watery suspension of decaying organic material <culturing soil amebas in lettuce >  .
 
 
 
Similar sounding terms:  in·va·sion 
 
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