seasonal affective disorder

noun
1.
recurrent winter depression characterized by oversleeping, overeating, and irritability, and relieved by the arrival of spring or by light therapy.
Abbreviation: SAD.
Origin
1980-85
British Dictionary definitions for seasonal affective disorder

seasonal affective disorder

noun
1.
a state of depression sometimes experienced by people in winter, thought to be related to lack of sunlight SAD
Contemporary definitions for seasonal affective disorder
noun

depression associated with the reduction of daylight during the shorter days of late autumn and winter; abbr. SAD

seasonal affective disorder in Medicine

seasonal affective disorder sea·son·al affective disorder (sē'zə-nəl)
n.
Abbr. SAD
A mild form of depression occurring at certain seasons of the year, especially depression that recurs in winter and that is characterized by loss of energy and sexual drive, restlessness, and often by a craving for carbohydrates.

seasonal affective disorder in Science
seasonal affective disorder
  (sē'zə-nəl)   
A mood disorder that occurs during seasons when exposure to sunlight is limited, characterized by symptoms of depression.