toxic substance; poisonous substance
A formal or technical term for any material that is toxic or poisonous. Used in scientific, medical, and regulatory contexts.
This factory has strict rules for handling toxic substances.
They are investigating the impact of toxic substances on the environment.
毒物 is a broader, more common term for 'poison' or 'toxic agent', while 毒性物質 is more technical and emphasizes the material's toxic properties.
有害物質 means 'harmful substance' and is a broader category that includes toxic substances but also other hazards like irritants or carcinogens.
Compound of 毒性 (toxicity) + 物質 (substance, matter).