Medical 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.
Last Editorial Review: 6/9/2016
Back to MedTerms online medical dictionary A-Z List
Need help identifying pills and medications?