Definitions for "Toxic substance"
A chemical or mixture that can cause illness, death, disease, or birth defects. The quantities and exposures necessary to cause these effects can vary widely. Many toxic substances are pollutants and contaminants in the environment.
A chemical or mixture that may present an unreasonable risk of injury to health or the environment.
A substance that is present in the soil or the above ground atmosphere that inhibits the growth of plants and ultimately may cause deficiency symptoms or their death.