megalithic

 
Pronunciation: /mɛgəˈlɪθɪk/

adjective

Archaeology
  • relating to or denoting prehistoric monuments made of or containing megaliths: massive megalithic monuments
  • (often Megalithic) relating to or denoting prehistoric cultures characterized by the erection of megalithic monuments: the resident Megalithic peoples

Origin:

mid 19th century: from mega- 'large' + Greek lithos 'stone' + -ic