pertaining to or producing chemical change at high temperatures.

pyro- + chemical

pyrochemically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyrochemical (ˌpaɪrəʊˈkɛmɪkəl)
of, concerned with, being, producing, or resulting from chemical changes at high temperatures

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
pyrochemical   (pī'rō-kěm'ĭ-kəl)  Pronunciation Key 
Relating to or designating chemical activity at elevated temperatures. Pyrochemical reactions are used, for example, to bring about the transmutation of certain transuranic elements.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Plutonium metal is produced by pyrochemical processes in either centrifugal or stationary bombs.
Application of molten salts in pyrochemical processing of reactive metals.
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