The word 'thermography' is a modern scientific compound built directly from ancient Greek elements. The first part, 'thermo-', originates from the Greek thermos (hot, heat), which is itself derived from the Proto-Indo-European root gʷʰer-, meaning "warm, hot." The second part, '-graphy', comes from the Greek -graphia, a suffix formed from the verb graphein (to scratch, draw, write). Literally meaning "heat-writing," the term logically evolved from this concrete idea to describe any technique that records or visually represents temperature variations. Its modern abstract meaning, referring specifically to the production of thermal images, perfectly encapsulates this original logic of creating a graphic record based on heat.

Structure: thermo (heat) + graphy (writing, recording) - thermo: From Greek thermos, meaning "hot, heat." Functions as a combining form denoting heat. - graphy: From Greek -graphia, from graphein, meaning "to write, record." Functions as a suffix denoting a process or technique of writing, recording, or representing.