well·spring

[wel-spring]
noun
1.
the head or source of a spring, stream, river, etc.; fountainhead.
2.
a source or supply of anything, especially when considered inexhaustible: a wellspring of affection.

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

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World English Dictionary
wellspring (ˈwɛlˌsprɪŋ) [Click for IPA pronunciation guide]
 
n
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Wellspring is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a gadget; dingus; thingumbob.
Example sentences
To study the wellspring of atmospheric water, you have to start with tropical
  clouds.
None of this makes the moon a wellspring, and it would have a long way to go
  before it became a remotely hospitable place.
It's the wellspring of all human feelings, behaviors, experiences as well as
  the repository of memory and self-awareness.
We realize that the only way to keep learning from nature is to safeguard
  naturalness, the wellspring of good ideas.
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