fountainhead fountainhead /ˈfaʊntɪnhɛd/

noun

1. () An abundant source  ( well , wellspring , fountainhead )
   an abundant source
    She was a well of information
   she was a well of information
   
2. The source of water from which a stream arises  ( fountainhead , headspring , head )
   the source of water from which a stream arises
    They tracked him back toward the head of the stream
   they tracked him back toward the head of the stream