Triphenyl

Part of speech: noun

Definitions

1. A chemical group made of three phenyl rings bonded to a single central atom, commonly found in organophosphorus and organotin compounds
2. The prefix-type chemical radical consisting of three benzene-derived phenyl groups joined to one central atom in a molecule
3. A substituent in organic chemistry formed by three phenyl rings attached to a shared central atom, used in naming many compounds

Etymology: Triphenyl is a chemistry coinage built from two pieces that each carry a long history of their own. The first part, "tri-", comes from Greek and means "three," and in English it is used in chemical names to count groups attached to a parent molecule. The second part, "phenyl," is the more surprising one. It descends from the Greek "phainein," meaning "to show" or "to bring to light," which is also the root behind "phantom" and "phenomenon." The name arrived in chemistry through French, where "phényle" was formed to name a radical, and the Greek element "hulē," meaning "wood" or "matter," supplied the "-yl" ending that chemists attached to such radicals. Put together, triphenyl describes a structure with three phenyl groups bonded to a central atom or molecule. The term is a regular product of systematic chemical naming, so the history lies less in any single moment of invention than in the parts it borrows. Phenyl itself was named for benzene's relationship to illuminating gas, which is why a word meaning "to show" ended up in a chemist's vocabulary.