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mesectoderm

[ mĕz-ĕktə-dûrm′ ]
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n.
The part of the mesenchyme derived from ectoderm, especially from the embryonic neural crest from which the pigment cells, meninges, and most of the branchial cartilages develop.
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Test how much you really know about regular and irregular plural nouns with this quiz.
Question 1 of 9
Which of the following nouns has an irregular plural form?
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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