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seasonal affective disorder

noun [U]
 
 
/ˌsiː.zən.əl.əˈfek.tɪv.dɪˌsɔː.dər/ US  /-ˌsɔːr.dɚ/ (abbreviation SAD)

Definition

a medical condition in which a person does not have much energy and enthusiasm during the winter because of the reduced period of natural lightMental and psychiatric disorders
(Definition of seasonal affective disorder noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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