Breadcrumb Home > Dictionary > Index P primordium: Meaning and Definition of Find definitions for: pri•mor•di•um Pronunciation: (prī-môr'dē-um), [key] — pl. -di•a the first recognizable, histologically differentiated stage in the development of an organ. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: primordium (Thesaurus) primordial soup primp TrendingHere are the facts and trivia that people are buzzing about. Hard Labor Current Events This Week: June 2023 Languages Spoken in Each Country of the World User's Guide to Environmental Language The Washington Monument: Facts, History & Profile LGBT Pride Month | Biographies of Notable Individuals Civilian Labor Force ✖ Related Content Daily Word Quiz: visceral Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language