verb (used with object), refuted, refuting.
to prove to be false or erroneous, as an opinion or charge.
to prove (a person) to be in error.

1505–15; < Latin refūtāre to check, suppress, refute, rebut, equivalent to re- re- + -fūtāre presumably, “to beat” (attested only with the prefixes con- and re-; cf. confute)

refutable [ri-fyoo-tuh-buhl, ref-yuh-tuh-] , adjective
refutability, noun
refutably, adverb
refuter, noun
self-refuted, adjective
self-refuting, adjective
unrefutable, adjective
unrefutably, adverb
unrefuted, adjective
unrefuting, adjective

1. deny, disapprove, disprove, rebut, refute (see synonym study at deny) ; 2. disapprove, disprove, rebut, refute ; 3. dispute, refute ; 4. repudiate, refute, refudiate (see word story at refudiate).

1. disprove, rebut. 1, 2. confute. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
refute (rɪˈfjuːt)
1.  (tr) to prove (a statement, theory, charge, etc) of (a person) to be false or incorrect; disprove
2.  to deny (a claim, charge, allegation, etc)
[C16: from Latin refūtāre to rebut]
usage  The use of refute to mean deny is thought by many people to be incorrect

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1513, "refuse, reject," from L. refutare "drive back, repress, repel, rebut," from re- "back" + -futare "to beat," probably from PIE base *bhat- "to strike down" (cf. beat). Meaning "prove wrong" dates from 1545. Since c.1964 linguists have frowned on the subtle shift in meaning towards "to deny," as
it is used in connection with allegation.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Perhaps our brains can evolve in more than one direction, which in a way
  refutes those alarmist researchers.
First of all, research refutes the widespread belief that even low levels of
  radiation increase your risk of cancer.
They found water vapor of all different temperatures around the star, which
  refutes the vaporized comet theory.
But this refutes an argument that historians don't make.
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