The crossword solution for the term 'PERTAINING TO HEAT' is 'CALORIC'. Caloric is a term used to describe the energy contained in heat. It is a form of energy that is released when a substance undergoes a change of state, such as when a solid melts into a liquid or a liquid evaporates into a gas. Caloric is also used to describe the amount of energy required to raise the temperature of a given mass of a substance by one degree Celsius.