pri·​mor·​di·​um | \ prī-ˈmȯr-dē-əm How to pronounce primordium (audio) \
plural primordia\ prī-​ˈmȯr-​dē-​ə How to pronounce primordium (audio) \

Definition of primordium

: the rudiment or commencement of a part or organ

Examples of primordium in a Sentence

Recent Examples on the Web Sun spells out a half-century of empirical research, along with the roles of complex genetic signals, hormones, chromosomes and a small group of cells called the bipotential primordium. Heidi Stevens,, "Column: Marjorie Taylor Greene wants us to ‘trust the science’ on transgender rights. Here’s the science.," 26 Feb. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'primordium.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of primordium

1855, in the meaning defined above

History and Etymology for primordium

borrowed from German Primordium, borrowed from Latin prīmōrdium (in plural prīmōrdia) "beginnings, origin, source, elementary stage" — more at primordial

Keep scrolling for more

Learn More about primordium

Time Traveler for primordium

Time Traveler

The first known use of primordium was in 1855

See more words from the same year

Statistics for primordium

Last Updated

28 Feb 2021

Cite this Entry

“Primordium.” Dictionary, Merriam-Webster, Accessed 7 Mar. 2021.

Style: MLA
MLA Chicago APA Merriam-Webster

Keep scrolling for more

More Definitions for primordium


pri·​mor·​di·​um | \ -ē-əm How to pronounce primordium (audio) \
plural primordia\ -​ē-​ə How to pronounce primordium (audio) \

Medical Definition of primordium

: the rudiment or commencement of a part or organ : anlage the gonadal primordium

Comments on primordium

What made you want to look up primordium? Please tell us where you read or heard it (including the quote, if possible).


Test Your Vocabulary

Who Knew?

Name That Thing

Test your visual vocabulary with our 10-question challenge!


Anagram puzzles meet word search.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!