seasonal affective disorder: Meaning and Definition of

sea'sonal affec'tive disor'der

Pronunciation: [key]
  1. recurrent winter depression characterized by oversleeping, overeating, and irritability, and relieved by the arrival of spring or by light therapy. Abbr.: SAD
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.