Poisonous substance: a harmful chemical or material that can damage or kill living organisms; sometimes used as a legal classification (e.g., poisonous and deleterious substances).
この薬品は毒物に分類されているので、取り扱いには注意が必要だ。
This chemical is classified as a poisonous substance, so it must be handled with care.
誤って毒物を飲んでしまった場合はすぐに救急に連絡すること。
If you accidentally ingest a poisonous substance, contact emergency services immediately.
工場では毒物の保管場所に厳重な標識が付けられている。
At the factory, storage areas for poisonous substances are clearly marked and secured.