A Source

1. The person, place, or thing from which something (information, goods, etc.) comes or is acquired.
2. The accused refused to reveal the source of the illegal drugs she was selling.
3. Spring; fountainhead; wellhead; any collection of water on or under the surface of the ground in which a stream originates.
4. A reporter's informant.
5. (computing) Source code.
6. (electronics) The name of one terminal of a field effect transistor (FET).

wellspring