Pronunciation key

( ek′sō-thũrmik )



[exo + thermic < exo- out, + Gk. thermē heat].

  1. Chem. Designates or noting reactions which are accompanied with liberation of heat.
  2. Release of heat (as in combustion) due to a chemical change. See also exothermal. Release of heat, in opposition to absorbing heat. Compare to endothermic.

Also ex’o•ther′mal. (-məl) adj.

See Exothermic reaction and Thermochemistry.


  • The American College Dictionary (Random House) ©1949
  • Webster's New World Dictionary of the American Language (College Edition) ©1955
  • Funk and Wagnalls Standard Dictionary, Comprehensive International Edition ©1976
  • The American Heritage Dictionary, Second College Edition ©1985
  • Grolier Encyclopedia of Knowledge ©1991
  • Further Reading

  • exothermal
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