| Term 
 
        | The study of adverse effects of chemicals on living organisms |  | Definition 
 | 
        |  | 
        
        | Term 
 
        | Any chemical that can cause undesirable effects in living organisms. |  | Definition 
 | 
        |  | 
        
        | Term 
 
        | "natural" toxic substance produced by living cells or organisms |  | Definition 
 | 
        |  | 
        
        | Term 
 
        | any compound that is foreign to a living organism. |  | Definition 
 | 
        |  | 
        
        | Term 
 
        | specific chemical species that causes toxicity. This could be a parent compound, a metabolite, or a reactive biotransformation |  | Definition 
 | 
        |  | 
        
        | Term 
 
        | Refers to a characteristic pattern clinical signs that suggest a specific class of poisoning |  | Definition 
 | 
        |  | 
        
        | Term 
 
        | Statement about relative safety of a drug |  | Definition 
 | 
        |  | 
        
        | Term 
 
        | LDI or Tdl/ED99 --> want a value of at least 1 |  | Definition 
 | 
        |  | 
        
        | Term 
 
        | dose below which there is no toxic response |  | Definition 
 | 
        |  |