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primordium

pri·mor·di·um [ prī máwrdee əm ] (plural pri·mor·di·a [ prī máwrdee ə ])


noun 
Definition:
 
early tissue growth: a tissue or organ in the earliest stage of embryonic development, found when the dividing cells in the fertilized ovum first differentiate

[Late 16th century. < Latin (see primordial)]
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