(psychology) Winter seasonal affective disorder.

(anatomy) Synonym of philtrum

plural of infranasal depression

Alternative form of manic depression

(economics, business, finance, historical) A major economic collapse characterized by mass unemployment and limited business activity that lasted from 1929 to 1940 in the US and a similar period in many other countries.

(psychology) Summer seasonal affective disorder.

(psychology) Seasonal affective disorder.

(economics) Pertaining to the era immediately before the depression. / (psychiatry) Before a depression.

(psychology) Postpartum depression.

(biology) The reduced biological fitness in a given population as a result of inbreeding.