/ Dictionary / Index C cyclothymia: Meaning and Definition of Find definitions for: cy•clo•thy•mi•a Pronunciation: (sī"klu-thī'mē-u, sik"lu-), [key] — n. Psychiatry. a mild bipolar disorder characterized by instability of mood and a tendency to swing between mild euphorias and depressions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cyclothymia (Thesaurus) cyclostyle cyclotome Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language