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primordium

[ prahy-mawr-dee-uhm ]
/ praɪˈmɔr di əm /
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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.
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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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use primordium in a sentence

British Dictionary definitions for primordium

primordium
/ (praɪˈmɔːdɪəm) /

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
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