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Definition of Seasonal affective disorder
1. Noun. (pathology) A form of depression associated with the lack of natural light during the winter months. ¹
¹ Source: wiktionary.com
Medical Definition of Seasonal affective disorder
1. A syndrome characterised by depressions that recur annually at the same time each year, usually during the winter months. Other symptoms include anxiety, irritability, decreased energy, increased appetite (carbohydrate cravings), increased duration of sleep, and weight gain. Sad (seasonal affective disorder) can be treated by daily exposure to bright artificial lights (phototherapy), during the season of recurrence. (12 Dec 1998)