/ Dictionary / Index P plethora: Meaning and Definition of Find definitions for: pleth•o•ra Pronunciation: (pleth'ur-u), [key] — n. overabundance; excess: a plethora of advice and a paucity of assistance. a morbid condition due to excess of red corpuscles in the blood or increase in the quantity of blood. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: plethora (Thesaurus) plessor plethoric Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language