exothermic[ek′sō t̸hʉr′mik, -sə-]
Combustion where heat is released is an example of an exothermic reaction.
Origin of exothermicexo- + thermic
(comparative more exothermic, superlative most exothermic)
From French exothermique, from exo- "outside" + thermique "of heat", both ultimately from Ancient Greek.