dis·proof

[dis-proof]
noun
1.
the act of disproving.
2.
proof to the contrary; refutation.

Origin:
1525–35; dis-1 + proof

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World English Dictionary
disproof (dɪsˈpruːf) [Click for IPA pronunciation guide]
 
n
1.  facts that disprove something
2.  the act of disproving

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Disproof is a GRE word you need to know.
So is dismal. Does it mean:
to refuse to allow; reject; veto:
causing gloom or dejection
Example sentences
Research provides no proof, or disproof, for any of these links.
Equally, a disproof would be the mathematical equivalent of an earthquake,
  destroying decades of work at a stroke.
Either they make no contentions which are subject to disproof or they quickly
  redesign doctrine after disproof.
In many ways, it was the birth of modern astronomy--a shining disproof of the
  belief that the heavens were fixed and unchanging.
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