mood disorder [AS, mod, mind; L, dis + ordo, rank] , a variety of conditions characterized by a disturbance in mood as the main feature. If mild and occasional, the feelings may be normal. If more severe, they may be a sign of a major depressive disorder or dysthymic reaction or be symptomatic of a bipolar disorder. Other mood disorders may be caused by a general medical condition. Mood disorder is a DSM-IV term. Also called affective disorder.
