ChEBI

Any environmental contaminant that is resistant to environmental degradation through photolytic, biological or chemical processes. Such substances can have significant impact on health and the environment, as they persist in the environment, bioaccumulate in animal tissue and so biomagnify in food chains.

Any compound that can disrupt the functions of the endocrine (hormone) system

Any compound that is added to manufactured materials to inhibit, suppress, or delay the production of flames and so prevent the spread of fire.