or chiefly Brit  leu*co*pla*kia  n :  a condition commonly considered precancerous in which thickened white patches of epithelium occur on the mucous membranes esp. of the mouth, vulva, and renal pelvis : also  :  a lesion or lesioned area of leukoplakia leu*ko*pla*kic or chiefly Brit  leu*co*pla*kic  adj 
 
 
 
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