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primordium

[prahy-mawr-dee-uh m] /praɪˈmɔr di əm/
noun, plural primordia
[prahy-mawr-dee-uh] /praɪˈmɔr di ə/ (Show IPA).
Embryology
1.
the first recognizable, histologically differentiated stage in the development of an organ.
Origin
1665-1675
1665-75; < Latin prīmōrdium, in plural: beginnings, elementary stage, equivalent to prīm(us) first (see prime) + ōrd(īrī) to begin + -ium -ium; cf. exordium
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for primordium

primordium

/praɪˈmɔːdɪəm/
noun (pl) -dia (-dɪə)
1.
(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
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primordium in Medicine

primordium pri·mor·di·um (prī-môr'dē-əm)
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.
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