Lu·gol's solution | \ lü-ˈgȯlz- 
\
\Medical Definition of Lugol's solution
: any of several deep brown solutions of iodine and potassium iodide in water or alcohol that are used in medicine (as for the internal administration of iodine) and as microscopic stains
— called also Lugol's iodine, Lugol's iodine solution
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