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primitive streak in Medicine

primitive streak

n.
  1. An ectodermal ridge in the midline at the caudal end of the embryonic disk from which the intraembryonic mesoderm arises.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.