leukoplakia

Definition of leukoplakia
National Cancer Institute

leukoplakia

(LOO-koh-PLAY-kee-uh)
An abnormal patch of white tissue that forms on mucous membranes in the mouth and other areas of the body. It may become cancer. Tobacco (smoking and chewing) and alcohol may increase the risk of leukoplakia in the mouth.

Source: NCI Dictionary of Cancer Terms