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Waardenburg syndrome - an inherited syndrome characterized by hearing impairment and albino characteristics such as very pale hair, skin, and/or distinctive blue color to one or both eyes, as well as wide-set inner corners of the eyes. Balance problems are also associated with some types of Waardenburg syndrome.

Wart - a non-cancerous skin growth caused by a virus.

Watermelon stomach - a condition in which parallel red blood vessels inside the stomach radiate out in a pattern that looks like the stripes on a watermelon.

Wedge resection of the lung - a small, localized section of the lung that is removed - often for a lung biopsy.

White blood cells (Also called WBCs or leukocytes.) - blood cells involved in the destruction of viruses, bacteria, and fungi.

White matter - nerve tissue that is paler in color than gray matter because it contains nerve fibers with large amounts of insulating material (myelin). The white matter does not contain nerve cells. In the brain, the white matter lies within the gray layer of the cerebral cortex.

Whole blood - blood containing all its components, such as red and white blood cells, platelets, and more.

Wolff-Parkinson-White syndrome - a condition in which an extra electrical pathway occurs between the atria and ventricles and causes rapid heartbeat.