/ Dictionary / Index P paramecium: Meaning and Definition of Find definitions for: par•a•me•ci•um Pronunciation: (par"u-mē'shē-um, -shum, -sē-um), [key] — pl. -ci•a any ciliated freshwater protozoan of the genus Paramecium, having an oval body and a long, deep oral groove. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: paramecium (Thesaurus) paramatta paramedic Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language