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toxic (adj) poisonous.
A toxic substance is a poisonous substance. The gases emitted by factory chimneys are toxic gases. That is, they are poisonous gases. Carbon dioxide is a toxic gas. It is a poisonous gas.
- As the factory caught fire, toxic gases began to spread all over the area. The poisonous gases spreading around the whole place killed all those who breathed them.
- Contaminated water may have toxic substances in it. These poisonous substances are harmful enough to cause death or serious diseases.