Category: N

An industrial chemical used in plating metals. It is toxic when inhaled, causing pulmonary edema.  

A depression or recess on a smooth surface, especially an erosion in the wall of a hollow organ, detected by radiography.  

In dentistry, the smooth or serrated blade of a condensing instrument that contacts the restorative material placed in a cavity preparation.  

A comprehensive U.S. federal program to promote the participation of disabled people in society by increasing access to built environments and transportation, making devices usable despite physical and sensory limitations, expanding educational and employment opportunities, and promoting increased access to community life.  

An acute viral disease of birds, particularly chickens. It occasionally produces incidental infections in humans, usually in the form of a mild conjunctivitis.  

A patch of pale skin in which blood vessels are narrowed or contracted and blood flow is locally limited.  

A nevus in which superficial blood vessels are enlarged. Nevi of this type are usually congenital. They are of variable size and shape, slightly elevated, and red or purple in color. They generally appear on the face, head, neck, and arms, though no region is exempt. The nevi usually disappear spontaneously, but wrinkling, pigmentation, and…

A congenital nevus that occurs in streaks or linear bands on one side of the body. It usually occurs between the neurotomes of the lumbar or sacral area.  

A white, spongy nevus that may occur in the mouth, labia, vagina, or rectum.  

A pigmented nevus with a smooth, unraised surface.