Source : Webster's Revised Unabridged Dictionary (1913)

Wellspring \Well"spring`\, n.
   A fountain; a spring; a source of continual supply.

         Understanding is a wellspring of life unto him that
         hath it; but the instruction of fools is folly. --Prov.
                                                  xvi. 22.

Source : WordNet®

wellspring
     n 1: the source of water for a well [syn: {wellhead}]
     2: an abundant source; "she was a well of information" [syn: {well},
         {fountainhead}]