wellhead

noun3

1. •
   The place where a spring breaks out of the ground; the source of water for a stream or well.

   • Leaue the troubled streames, And liue as Thriuers doe at the Well head. — 1607
2. •
   The surface structure of an oil well etc.
3. •
   (figurative) The source of something; a fountainhead.

   • [H]e likened was to a welhed / Of euill words, and wicked sclaunders by him shed. — 1596