Source : Webster's Revised Unabridged Dictionary (1913)

Wellhead \Well"head`\, n.
   A source, spring, or fountain.

         At the wellhead the purest streams arise. --Spenser.

         Our public-school and university life is a great
         wellhead of new and irresponsible words. --Earle.

Source : WordNet®

wellhead
     n 1: the source of water for a well [syn: {wellspring}]
     2: a structure built over a well