meg·a·lith
noun/ˈmeɡəlɪθ/
/ˈmeɡəlɪθ/
- a very large stone, especially one put in a place that was used for ceremonies in ancient times
（尤指古代用于祭祀的）巨石 Word Originmid 19th cent.: back-formation from megalithic, from mega- ‘large’ + Greek lithos ‘stone’.