Breadcrumb Home > Dictionary > Index P Cite penicillium: Meaning and Definition of Find definitions for: pen•i•cil•li•um Pronunciation: (pen"u-sil'?-um), [key] ? pl. -cil•li•ums, -cil•li•a any fungus of the genus Penicillium, certain species of which are used in cheesemaking and as the source of penicillin. Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease. See also: penicillium (Thesaurus) penicillin peninsula TrendingHere are the facts and trivia that people are buzzing about. February 2021 Current Events: US News The Berlin Conference and the Partition of Africa The Implied Powers of Congress Noble Titles and Ranks in a Monarchy Keeping Your Brain Active in a COVID-19 World The Manchu Related Content Daily Word Quiz: nosegay Analogy of the Day: Today?s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language