Exergonic

Exergonic means to release energy in the form of work. Its etymology stems from the suffix -ergonic, as derived from the Greek root ergon meaning work, combined with the Greek prefix ex- meaning out of. By thermodynamic standards, work, a form of energy, is defined normally to move from the system (the internal region) to the surroundings (the external region). Thus, an exergonic process, as contrasted with an Gibbs free energy is less than 0, the reaction is exergonic (releases energy).