Synonyms for poisonous substance
poi·sonous sub·stance

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1. poison, toxicant, poisonous substancenoun

   any substance that causes injury or illness or death of a living organism

   Synonyms:
   toxicant, poison

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1. • Substance

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How to use poisonous substance in a sentence?

1. Vladimir Putin:

   A military-grade poisonous substance is so powerful that the person dies within seconds or minutes, we repeatedly offered UK authorities our help, and we asked to be given access to the investigation, but there is no response.

2. Dante Sorianello:

   Sometimes one cookie, if you’re making it at home, gets more chips in it than the other. If you’re doing that with a potentially fatal poisonous substance, if you make a hot pill, that will kill somebody. it used to be a kilo here, 10 kilos there. We’re seizing 100 kilos, 40 kilos, 50 kilos.