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Definition of Primordium

Primordium: In embryology, organ or tissue in its earliest recognizable stage of development. Take, for example, the thyroid primordium. The plural is primordia. Borrowed directly from the Latin primordium (to begin), derived from the Latin words primus (first) + ordiri (to begin). Known also as the anlage or rudiment.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=33809
Last Editorial Review: 9/20/2012

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