Definition of PMS noun from the Oxford Advanced American Dictionary

 

PMS

 noun
noun
NAmE//ˌpi ɛm ˈɛs//
 
[uncountable]
 
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physical and emotional problems, such as pain and feeling depressed, that many women experience before their period (= flow of blood) each month. PMS is an abbreviation forpremenstrual syndrome. Symptoms of PMS include breast tenderness and a craving for sweet food. see also premenstrual
See the Oxford Advanced Learner's Dictionary entry: PMS