- any mental disorder, as depressive disorder, bipolar disorder, or cyclothymia, in which a major disturbance of feelings or emotions is predominant.
- any mental disorder, such as depression or mania, that is characterized by abnormal disturbances of mood
- mood disorder
- Any of a group of psychiatric disorders, including depression and bipolar disorder, characterized by a pervasive disturbance of mood. Also called affective disorder
- See mood disorder.