avulsion

/AH0 V AH1 L SH AH0 N/
noun
  1. 1

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

  2. 2

    An abrupt change in the course of a river, typically from one channel to another

  3. 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

Source: https://en.wiktionary.org/wiki/avulsion