Pyrolysis

Part of speech: noun

Pronunciation: /paɪˈɹɒlɪsɪs/

Definitions

1. The transformation of organic materials through heating occurs without the presence of oxygen, resulting in their breakdown and chemical alteration
2. The process of chemical decomposition involves heating organic materials in an atmosphere devoid of oxygen, leading to their breakdown into simpler compounds
3. A chemical process where organic substances break down due to heat applied in an oxygen-free environment

Etymology: Pyrolysis is a deliberately constructed scientific term, built from two Greek elements. "Pyr" comes from Ancient Greek "pûr", meaning fire, and the second half comes from "lúō", meaning to loosen, release or dissolve. Its Greek ancestor "lúsis" meant a loosening or untying, and the suffix "-sis" turns the verb into a process noun, so the word literally names a process of breaking apart through fire. The word's Greek parts are very old, but the compound itself is a modern coinage made from them, not something the ancient Greeks would have recognised. Chemists needed a name for decomposition caused by heat in the absence of air, and they assembled it from familiar classical building blocks in the same way they coined many other technical terms. The "-lysis" ending is shared with words such as "analysis" and "electrolysis", which is why it sounds so comfortably scientific.