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From Biology-Online Dictionary | Biology-Online Dictionary
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(1) Normal, non-depressed, reasonably positive mood; joyfulness; mental peace; tranquility.

(2) Neutral mood, or the absence of depressive or manic cycle (as experienced by people with bipolar disorder).


Word origin: from Greek, :ευθυμία, "gladness, good mood, serenity” + thymos, “mind“.

Related forms: euthymic (adjective).

Compare: dysthymia.