[prahy-mawr-dee-uh m]

noun, plural pri·mor·di·a [prahy-mawr-dee-uh] /praɪˈmɔr di ə/. Embryology.

the first recognizable, histologically differentiated stage in the development of an organ.

Origin of primordium

1665–75; < Latin prīmōrdium, in plural: beginnings, elementary stage, equivalent to prīm(us) first (see prime) + ōrd(īrī) to begin + -ium -ium; cf. exordium Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for primordium

commencement, origin, start, birth, dawning, primordium

Examples from the Web for primordium

Historical Examples of primordium

British Dictionary definitions for primordium


noun plural -dia (-dɪə)

biology an organ or part in the earliest stage of development
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

primordium in Medicine



n. pl. pri•mor•di•a (-dē-ə)

An aggregation of cells in the embryo indicating the first trace of an organ or structure.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.