the head or source of a spring, stream, river, etc.; fountainhead.
a source or supply of anything, especially when considered inexhaustible: a wellspring of affection.

before 900; Middle English welle spring, Old English wyllspring; see well2, spring

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World English Dictionary
wellspring (ˈwɛlˌsprɪŋ)
1.  the source of a spring or stream; fountainhead
2.  a source of continual or abundant supply
[Old English welspryng, wylspring; see well², spring]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It's the wellspring of all human feelings, behaviors, experiences as well as
  the repository of memory and self-awareness.
Beneath the pop-culture references and the determinedly flat language is a
  wellspring of anguish.
None of this makes the moon a wellspring, and it would have a long way to go
  before it became a remotely hospitable place.
She lacks the soul of a romantic dreamer, which is the wellspring of a
  compelling screen heroine.
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