Pyrolytic

Part of speech: adjective

Definitions

1. Referring to a process that breaks down materials using high heat without oxygen to create gas or solid residues
2. Involving the thermal transformation of substances into gaseous or charcoal forms through the application of heat in an inert atmosphere
3. Relating to the method of decomposing organic materials at elevated temperatures in the absence of oxygen to produce gaseous byproducts or char

Etymology: Ancient Greek "pyr" meant fire, and it has come down through Latin "pyr" and into modern English as the first half of a whole family of scientific words. "Pyrolytic" is simply "pyro-" joined to "lytic," the adjective from "lysis," a Greek noun meaning loosening or dissolving. Put together, the word describes a substance broken down by heat alone, with no oxygen or other chemical reagent needed to do the work. The "pyro-" prefix is one of the most productive in modern science, appearing in words from pyrotechnics to pyrometer. "Lytic" follows the same pattern, drawing on the Greek root behind words such as "analysis" and "paralysis," where the sense of loosening is still visible. Like most technical coinages of this kind, the word is a modern construction from classical parts rather than something the ancient Greeks themselves used.