epi·​thermal | \¦epə̇, ¦epē+\

Definition of epithermal 

1 : deposited from warm waters at rather shallow depth under conditions in the lower ranges of temperature and pressure used of mineral veins and ore deposits — compare hypothermal, mesothermal

2 : having translational speeds and energies greater than those usually due to thermal agitation but less than those required for nuclear fission epithermal neutrons

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History and Etymology for epithermal

epi- + thermal

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to clear from alleged fault or guilt

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