IPA: /ˌpaɪrəˈlɪtɪkli/
KK: /pɪˈroʊlɪtɪkli/
In a way that involves the chemical decomposition of organic materials through the application of heat in the absence of oxygen.
The waste was treated pyrolytically to reduce its volume and toxicity.
Pyrolytically → It is formed from "pyro-" (from Greek "pur", meaning fire) and "lytic" (from Greek "lytikos", meaning capable of loosening or dissolving) and the suffix "-ally" (meaning in a manner). The word "pyrolytically" refers to a process that occurs in a manner related to the decomposition or transformation of materials through the application of heat or fire.
Think of 'fire' ('pyro-') causing something to 'loosen' or 'dissolve' ('lytic') — that's how pyrolytically describes a process involving heat.