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au·to·ther·mal | \ ˌȯ-tō-ˈthər-məl 
\
\Definition of autothermal
chemistry
: of, relating to, or being a reaction that creates synthesis gas using only the heat produced by the reaction itself
One of the major advantages of thermophilic digestion (anaerobic and aerobic) is the ability to operate the digester under autothermal conditions. The biogas produced can be used as a heat source for the digester and to generate power.— T. Amani et al., Environmental Reviews, December 2010
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The first known use of autothermal was in 1923
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