Etymology
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disproof (n.)

"proof to the contrary, confutation, refutation," 1530s, after disprove; see dis- + proof (n.). Earlier was dispreve (c. 1400), from dispreven (late 14c.), from Old French tonic stem of desprover.

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Definitions of disproof

disproof (n.)
any evidence that helps to establish the falsity of something;
disproof (n.)
the act of determining that something is false;
Synonyms: falsification / falsifying / refutation / refutal
From wordnet.princeton.edu