noun Chemistry.
the subjection of organic compounds to very high temperatures.
the resulting decomposition.

1885–90; pyro- + -lysis

pyrolytic [pahy-ruh-lit-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyrolysis (paɪˈrɒlɪsɪs)
1.  the application of heat to chemical compounds in order to cause decomposition
2.  chemical decomposition of compounds caused by high temperatures

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American Heritage
Medical Dictionary

pyrolysis py·rol·y·sis (pī-rŏl'ĭ-sĭs)
Decomposition or transformation of a chemical compound caused by heat.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
Garbage is an excellent feedstock for pyrolysis that has so far been wasted.
The technique is cheap and the pyrolysis units are available.
The pyrolysis gases contain energy, valuable extractives and simple pathways to fuel.
Comparison of the calorific nature of slow pyrolysis and hydrothermal carbonization of cellulose.
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