negator

Collins Concise English Dictionary © HarperCollins Publishers::

negator /nɪˈɡeɪtə/ n

Also: negater a person or thing that negates

ne•gate /nɪˈgeɪt, ˈnɛgeɪt/USA pronunciation v. [~ + object], -gat•ed, -gat•ing.

See -neg-.

ne•gate (ni gāt′, neg′āt),USA pronunciation v., -gat•ed, -gat•ing.
v.t.

to deny the existence, evidence, or truth of:an investigation tending to negate any supernatural influences.
to nullify or cause to be ineffective:Progress on the study has been negated by the lack of funds.

v.i.

to be negative;
bring or cause negative results:a pessimism that always negates.

Latin negātus (past participle of negāre to deny, refuse), equivalent. to neg- (variant of nec not; see neglect) + -ā- theme vowel + -tus past participle suffix
1615–25

ne•ga′tor, ne•gat′er, n.

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