noun, plural primordia [prahy-mawr-dee-uh] . Embryology.
the first recognizable, histologically differentiated stage in the development of an organ.

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 Dictionary, © Random House, Inc. 2014.
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World English Dictionary
primordium (praɪˈmɔːdɪəm)
n , pl -dia
biology an organ or part in the earliest stage of development

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American Heritage
Medical Dictionary

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
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