Perfluoroether

Part of speech: noun

Definitions

1. A class of chemically stable organic compounds in which the hydrogen atoms of an ether have been replaced entirely by fluorine atoms
2. An ether molecule whose carbon-bonded hydrogens are all substituted with fluorine, giving a highly inert and heat-resistant substance
3. A fully fluorinated ether, a type of compound prized for its chemical stability and used in specialized industrial and engineering fluids

Etymology: Perfluoroether is a chemist's construction built from parts that each carry a precise meaning. "Per-" in chemistry signals that every hydrogen atom has been replaced by fluorine, so the molecule is "perfluorinated" throughout. "Fluoro-" names the element fluorine, taken from Latin "fluere" ("to flow"), via the mineral fluorspar, which was named for its use as a flux in smelting. "Ether," which goes back through Latin and Greek to a word for the upper, bright air, was adopted in chemistry for a class of compounds in which two carbon groups are joined through a single oxygen atom. The compound name follows the systematic naming conventions that chemists developed in the nineteenth and twentieth centuries, when fluorinated materials became commercially important. Because the formula combines these prefixes and stems mechanically, the word describes structure rather than history: any reader who knows the parts can work out what the substance is made of.