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 as moving from the system (the internal region) to the surroundings (the external region). Thus, an exergonic process, as contrasted with an endergonic process, is one that releases energy from the system, of which it's a part, to… (More on Exergonic)