THERMOLYSIS f . Chemistry, Thermodynamics: thermo, heat, temperature and lysis, solution. Decomposition of a substance by means of heat. The Rae rejects this spelling and maintains that all terms ending in lysis are compass voices, as they retain their etymological accentuation. However he accepts both in some voices. Ergo , THERMOLYSIS , catalysis , analysis , Umlauts , paralysis , dialysis , hydrolysis , pyrolysis , photolysis , hemolysis . But, for example, it accepts hydrolysis, photolysis, hemolysis. In oarticular, thermolysis is not an accepted voice, so neither is thermolysis. Thermolysis consists of a momecular distancing due to the action of heat that reduces the forces of molecular cohesion