- the first recognizable, histologically differentiated stage in the development of an organ.
Origin of primordium
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for primordia
It does not therefore follow, because these primordia semina rerum are not discoverable, that therefore they may not exist.An Introduction to Entomology: Vol. III (of 4)
No wonder that at a time of such turbulence fine society also should have shown the primordia of a great change.The Works of Max Beerbohm
- 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
- 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.