Final answer:
The correct architectural term for massive walls associated with a Mycenaean megaron is 'Cyclopean masonry,' which refers to the construction with huge, roughly shaped stone blocks.
Step-by-step explanation:
The question asks to identify the term that best describes massive walls that are characteristic of a megaron, the chief or throne room of a palace, in Mycenaean architecture. The correct term is Cyclopean masonry, which is a method of construction using huge, roughly shaped blocks of stone.
Megaron served as central throne rooms in Mycenaean citadel sites, which were often surrounded by Cyclopean walls for protection and defense. Notable characteristics of a megaron include its rectangular hall, central hearth, and position often on the highest part of the acropolis.
The term 'Cyclopean' is linked to the ancient Greek belief that these large stones were moved by the mythological Cyclopes, hence the name. Cyclopean masonry is distinguished from Doric, Ionic, and Corinthian, which are types of classical Greek architectural orders.