WELLSPRING
well, wellspring, fountainhead
(noun) an abundant source; “she was a well of information”
wellhead, wellspring
(noun) the source of water for a well
Source: WordNet® 3.1
Etymology
Noun
wellspring (plural wellsprings)
The source of water for a stream, spring or well; a fountainhead; a wellhead.
(figurative) A perennial source of anything; a fountainhead of supply or emanation; resource.
Source: Wiktionary
Well"spring` n.
Definition: 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: Webster’s Unabridged Dictionary 1913 Edition