This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. Decomposition or transformation of a compound caused by heat.

n. The decomposition of a material or compound due to heat in the absence of oxygen or any other reagents

n. Chemical decomposition produced by exposure to a high temperature.

n. transformation of a substance produced by the action of heat

"They analyzed gases emitted by 12 meteorites of the sort believed to have hit during the bombardment using a new laboratory technique called pyrolysis-FTIR, which can instantly heat samples to 1,000 degrees Celsius."

transmutation    transformation    shift   

autolysis    photolysis    hydrolysis    electrolysis    fire   

pyrolyse    pyro-    pyrolyze    pyrolytic    pyrolytically   

chromatography-mass    thin-layer    diamine    hydrodynamic    formulator