Medical Definition of euthymia
: a normal, tranquil mental state or mood; specifically : a stable mental state or mood in those affected with bipolar disorder that is neither manic nor depressive … there were no significant differences among groups in the rates of durable recovery, defined as 8 consecutive weeks of euthymia without a switch to mania or hypomania.—Mark A. Frye, The New England Journal of Medicine, 6 Jan. 2011
euthymic\-mik\ play adjective the euthymic phase of bipolar disorder
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