Medical Definition of target
1: something to be affected by an action or development; specifically : an organ, part, or tissue that is affected by the action of a hormone
2a: the metallic surface usually of platinum or tungsten upon which the stream of electrons within an X-ray tube is focused and from which the X-rays are emittedb: a body, surface, or material bombarded with nuclear particles or electrons
3: the thought or object that is to be recognized (as by telepathy) or affected (as by psychokinesis) in a parapsychological experiment
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