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primordia

 - 4 dictionary results

pri⋅mor⋅di⋅um

  [prahy-mawr-dee-uhm]
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–noun, plural -di⋅a  [-dee-uh] . Embryology.
the first recognizable, histologically differentiated stage in the development of an organ.
Origin:
1665–75; < L prīmōrdium, in pl.: beginnings, elementary stage, equiv. to prīm(us) first (see prime ) + ōrd(īrī) to begin + -ium -ium; cf. exordium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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pri·mor·di·um   (prī-môr'dē-əm)   
n.   pl. pri·mor·di·a (-dē-ə)
An organ or a part in its most rudimentary form or stage of development.

[Latin prīmōrdium; see primordial.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: pri·mor·di·um
Pronunciation: -E-&m
Function: noun
Inflected Form: plural pri·mor·dia /-E-&/
: the rudiment or commencement of a part or organ : ANLAGE primordium>
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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