Polyfluoroalkyl

Part of speech: adjective

Definitions

1. Describing a chemical group in which many or most hydrogen atoms on a carbon chain have been replaced by fluorine atoms
2. Relating to an organic compound whose carbon backbone carries numerous fluorine atoms in place of hydrogen
3. Characterizing molecules with a carbon chain that is extensively fluorinated, making them highly resistant to breakdown

Etymology: Polyfluoroalkyl is a compound built from three pieces, each with its own history. "Poly-" comes from Ancient Greek "polús", meaning "many", and "fluoro-" comes from Latin "fluor", meaning "flow", a name tied to fluorspar, the mineral used as a flux that helps metals and glass melt. "Alkyl" descends from "alcohol", which traces back through Arabic "kuḥl", a fine powder once used as eyeliner, and the suffix "-yl" comes from the Greek word "hū́lē", meaning "wood" or "matter". The chemistry sits in the combination. "Fluoro-" marks fluorine atoms attached to a carbon chain, "alkyl" names that chain, and "poly-" says there are many of them. Together the term describes a molecular group in which many carbon-bonded hydrogens have been replaced by fluorine.