Noun
One who nullifies or makes void; one who maintains the right to nullify a contract by one of the parties.
Source: Webster's dictionarymy bank check was voided and I wanted to know who the invalidator was Source: Internet
Doctor Doom and Alpha-Reed Richards tried to stop them although Alpha-Reed Richards was killed using the Ultimate Nullifier while Doctor Doom was apparently killed by the Mad Celestials. Source: Internet
Knowing that the Fantastic Four would use it against him, he spares the Earth and reclaims the Ultimate Nullifier. Source: Internet