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Apathy: definition

An abnormal emotional state that is characterized by indifference to things which others find interesting, moving or exciting, and diminished motivation to perform regular daily activities.

Arthritis, Psoriatic: definition

A joint manifestation of psoriasis, a systemic autoimmune disease, characterized by asymmetric involvement in one or more joints, especially affecting the distal phalangeal joints of fingers and toes at tips.

Autistic Disorder: definition

A non-progressive psychiatric syndrome appearing in childhood characterized by significantly abnormal withdrawal from communication with others often accompanied by repetitive or primitive behaviors.