Taber’s Cyclopedic Medical Dictionary Online + App from F.A. Davis and Unbound Medicine. Find 65,000 medical and nursing definitions. Download to iPhone, iPad, and Android. Explore these free sample topics:
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Scale that exfoliates from the outer layer of the skin, esp. from the scalp.
Several over-the-counter products, including salicylic acid, pyrithione zinc, and selenium sulfide, provide effective treatment.