—adj. of or pertaining to a substance that is used in the treatment of mood disorders, as characterized by various manic or depressive affects.
—n. Also called energizer, psychic energizer. any such substance, as a tricyclic antidepressant, MAO inhibitor, or lithium. Also,an"ti-de•pres'sant,an•ti•de•pres•sivePronunciation: (an"tē•di•pres'iv, an"tī-).[key]