from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An organ or a part in its most rudimentary form or stage of development.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An aggregation of cells that is the first stage in the development of an organ

from The Century Dictionary and Cyclopedia

  • n. Beginning; commencement; origin.
  • n. In botany, the ultimate beginning of any structure.
  • n. In embryology, the first trace of a future organ.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an organ in its earliest stage of development; the foundation for subsequent development


Latin prīmōrdium; see primordial.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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  • Small primordia (initial fruiting bodies) will be formed at the beginning of the reproductive phase. Under the right conditions, these primordia will develop into fruiting bodies. Primordial is plural of Primordium; the earliest stage of an organ.

    January 25, 2011