de-activator

de·ac·ti·vate

[dee-ak-tuh-veyt] verb, de·ac·ti·vat·ed, de·ac·ti·vat·ing.
verb (used with object)
1.
to cause to be inactive; remove the effectiveness of.
2.
to demobilize or disband (a military unit).
3.
to render (a bomb, shell, or the like) inoperative, especially by disconnecting, removing, or otherwise interfering with the action of the fuze.
4.
Chemistry. to render (a chemical, enzyme, catalyst, etc.) inactive.
verb (used without object)
5.
Physical Chemistry. to lose radioactivity.

Origin:
1900–05; de- + activate

de·ac·ti·va·tion, noun
de·ac·ti·va·tor, noun
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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De-activator is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a stew of meat, vegetables, potatoes, etc.
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