The Collaborative International Dictionary
Pyrology
Pyrology \Py*rol"o*gy\, n. [Pyro- + -logy: cf. F. pyrologie.] That branch of physical science which treats of the properties, phenomena, or effects of heat; also, a treatise on heat.
Wiktionary
pyrology
n. (context dated English) the scientific study of the effects of heat or flame, often in regards to explosives or chemical compounds.