Definition of Primordium

1. Bad Bugs and Their Bites Slideshow
2. Heartburn: Foods to Eat and Avoid Slideshow
3. Understanding Multiple Sclerosis Slideshow

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.

Need help identifying pills and medications?
Use the pill finder tool on RxList.