deactivator
nounUK /ˌdiːˈæktɪveɪtə(ɹ)/
Etymology From deactivate + -or.
1
Any device used to deactivate something.
2
A chamber filled with iron filings or other material used to remove excess oxygen or other substances from water.
Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.