In this subchapter:

((1)) ** Director** The term “Director” means the Director of the United States Geological Survey.

((2)) ** Highly fluorinated compound**

((A)) ** In general** The term “highly fluorinated compound” means a perfluoroalkyl substance or a polyfluoroalkyl substance with at least one fully fluorinated carbon atom.

((B)) ** Definitions** In this paragraph:

((i)) ** Fully fluorinated carbon atom** The term “fully fluorinated carbon atom” means a carbon atom on which all the hydrogen substituents have been replaced by fluorine.

((ii)) ** Perfluoroalkyl substance** The term “perfluoroalkyl substance” means a chemical of which all of the carbon atoms are fully fluorinated carbon atoms.

((iii)) ** Polyfluoroalkyl substance** The term “polyfluoroalkyl substance” means a chemical containing at least one fully fluorinated carbon atom and at least one carbon atom that is not a fully fluorinated carbon atom.