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Noun: neutraliser
Usage: Brit (N. Amer: neutralizer)
  1. A substance or agent that neutralizes something, especially an acid or base
    "Baking soda can act as a neutraliser for acidic odours";
    - neutralizer
     
  2. A device or substance that counteracts or eliminates something undesirable
    "The air purifier served as a neutraliser for allergens in the room";
    - neutralizer

Derived forms: neutralisers