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primordium
primordium definition
pri·mor·dium (prī môr′dē əm)
noun pl. primordia -·dia (-ə)
Embryology the first recognizable aggregation of cells that will form a distinct organ or part of the embryo
Etymology: ModL < L: see primordial
Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
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