One who, or that which, nullifies.

plural of nullifier

The act or process by which something is nullified.

present participle of nullify

Third-person singular simple present indicative form of nullify

(transitive, law) To make legally invalid. / To prevent from happening. / To make of no use or value; to cancel out.

Able, or allowed to be nullified.

That has been declared null / (computing) Whose value has been set to null

simple past tense and past participle of nullify

plural of nullifying