SINCE 1828
epithermal
adjective
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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