avulsion

noun3

1. •
   The loss or separation of a body part, either by surgery or due to trauma.

   • Immediately observable were avulsion of several teeth and extensive lacerations and bruising to the face.
2. •
   An abrupt change in the course of a river, typically from one channel to another.
3. •
   Movement of soil during a flood, or during a change in the course of a river, especially when a resulting change of land ownership is involved.