megalith
/ˈmeɡəlɪθ/·메갈리스·noun
a large prehistoric stone used as a monument
GreekCEFR C1
Root
Greek 'megas' (large) + 'lithos' (stone)
Greek megas + lithos → French mégalithe (19th c., archaeology) → English megalith (1853)
In a word
Greek megas (large) + lithos (stone). A 19th-century archaeologist's term. The lith family carves out 'stone ages' — megalith (large stone), monolith (single stone), neolithic (new stone age), paleolithic (old stone age). Stonehenge standing on its plain is an event much older than the meeting of two Greek pieces inside an archaeology textbook.
Examples
Stonehenge is a famous megalith.
Ancient peoples hauled megaliths over miles.
The megalith stood alone on the plain.
Related
megalithicmonolithlithicneolithicpaleolithic