Definition of primordium in English:

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Pronunciation: /prīˈmôrdēəm/

noun (plural primordia /-dēə/)

An organ, structure, or tissue in the earliest stage of development.
Example sentences
  • Although mitoses were still detected in leaf primordia of that stage, cell differentiation had already started.
  • In flowers, both genes are expressed throughout inflorescence and floral meristems and in developing organ primordia.
  • The development is initiated as a hyphal knot of 0.2 mm or less in diameter, which rapidly develops into a tiny primordium containing the rudimentary tissues of the future pileus and stipe.


Late 19th century: from Latin, neuter of primordius 'original', from primus 'first' + ordiri 'begin'.

For editors and proofreaders

Syllabification: pri·mor·di·um

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