Pipecolic

Part of speech: adjective

Definitions

1. Relating to or denoting pipecolic acid, a cyclic amino acid found in certain plants and used in biochemical research
2. Of or concerning pipecolic acid, an amino acid compound with a six-membered nitrogen-containing ring structure
3. Pertaining to pipecolic acid, a naturally occurring amino acid derived from lysine and studied in organic chemistry

Etymology: "Pipecolic" is a chemistry term, and its name is built from parts that each record a step in how chemists named the compound. The base is "pipecoline," itself built from "pipe(ridine)," the name of the nitrogen-containing ring compound piperidine as it was styled in chemical nomenclature, followed by "-ol" and "-ine" endings. Piperidine itself takes its name from "piper," Latin for pepper, because it is found in black pepper. The adjective "pipecolic" then adds "c(arb)o(xy)l," shorthand for the carboxyl group, the -COOH unit that makes an acid. Pipecolic acid is therefore a piperidine ring carrying a carboxylic acid group, with the "-ic" ending marking it as an acid. The word is a purely technical coinage, assembled by chemists to describe a specific molecule, so its history lies in naming conventions rather than in everyday speech.