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trophectoderm

(trŏf-ĕktə-dûrm′, trō-fĕk-)
n.
  1. The cell layer from which the trophoblast differentiates.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.