plural of perfluoroalkyl substance

(officialese, law) A drug or chemical whose use, possession, manufacture, or sale is regulated or banned by the government.

(zoology) chemical given off from the skin of a fish after injury that warns nearby fish of danger.

An overindulgence in and dependence on a drug or other chemical.

(physics, chemistry) A material with a specific chemical composition.

(biochemistry) A tachykinin neuropeptide associated with inflammatory processes and pain.

(Canada, law) The content or subject matter, the leading feature or true nature and character of a law.

(chemistry) The number of particles or formula units (depending on type) present of some substance in some sample; SI unit: mole.

plural of amount of substance

With respect to substance.