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id (id)   a freudian term used to describe that part of the personality which harbors the unconscious, instinctive impulses that lead to immediate gratification of primitive needs such as hunger, the need for air, the need to move about and relieve body tension, and the need to eliminate. Id impulses are physiologic and body processes, as opposed to the ego and superego, which are psychologic and social processes. The id is dominated by the pleasure principle and some gratification of the id impulses is necessary for survival of a person's personality.
 

id reaction  a localized or generalized, sterile secondary skin eruption occurring in sensitized patients as a result of circulation of allergenic products from a primary site of infection; the morphology and site of the lesion vary.





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