Taber’s Cyclopedic Medical Dictionary Online + Mobile powered by Unbound Medicine. Find 65,000 medical and nursing definitions. Download to iPhone, iPad, and Android. Explore these free sample topics:
-- The first section of this topic is shown below --
1. To determine the presence of a disease or its characteristics in a broad community or a selected group.
2. A structure or substance used to protect, guard, or shield from a damaging influence such as x-rays, ultraviolet light, or insects.
3. A system used to select or reject personnel.
4. In psychiatry, the blocking of one memory with another.