[1] : The Collaborative International Dictionary of English v.0.48

headspring \head"spring`\ he^d"spri^ng`, n.
   fountain; source.
   1913 webster

         the headspring of our belief.            --stapleton.
   1913 webster

[2] : WordNet (r) 2.0

headspring
     n : the source of water from which a stream arises; "they
         tracked him back toward the head of the stream" syn: fountainhead,
          head
see also:
fountainhead head 

Headspring >> H Words
Headspring, definition of term: Headspring
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