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Quick Answer. In a psychological context, labile mood refers to a mood state in which a person experiences wild, uncontrolled mood swings. Labile mood is also known as labile affect, emotional dysregulation and pseudobulbar affect.
Definition of CONTRACTILE VACUOLE. : a vacuole in a unicellular organism that contracts regularly to discharge fluid from the body.See contractile vacuole defined for kids. ADVERTISEMENT.ontractile vacuole. noun. : a vacuole in a unicellular organism that contracts regularly to discharge fluid from the body.