WordReference Random House Unabridged Dictionary of American English © 2026
bipo′lar disor′der, [Psychiatry.]
  1. Psychiatryan affective disorder characterized by periods of mania alternating with periods of depression, usually interspersed with relatively long intervals of normal mood. Formerly, manic-depressive illness. 

Collins Concise English Dictionary © HarperCollins Publishers::
bipolar disorder, bipolar affective disorder, bipolar syndrome
  1. a disorder characterized by an alternation between mania and deep depression
    Former name: manic depression
'bipolar disorder' also found in these entries (note: many are not synonyms or translations):
affective disorder - bipolar - cyclothymia - lithium - manic-depressive - manic-depressive illness

Forum discussions with the word(s) "bipolar disorder" in the title:


Look up "bipolar disorder" at Merriam-Webster
Look up "bipolar disorder" at dictionary.com
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