Carbon monoxide is a colourless, odourless, poisonous gas.
These normally harmless substances combine to form a highly poisonous gas.
Thousands of fish were killed as a result of a discharge of poisonous chemicals from a nearby factory.
Fungus can be poisonous.
They demonstrated this for artificial agents foraging in a simulated environment composed of edible and poisonous mushrooms.
Although the name literally means nonpoisonous, atoxyl damages especially the optic nerve.
Others held cloths before their mouths, as if the smoke drifting over from the charring bodies was poisonous.
