Noun
One of the large sandstone blocks scattered over the English chalk downs; -- called also sarsen stone, and Druid stone.
Source: Webster's dictionaryStonehenge 3 V (1930 BC to 1600 BC) Soon afterwards, the north eastern section of the Phase 3 IV bluestone circle was removed, creating a horseshoe-shaped setting (the Bluestone Horseshoe) which mirrored the shape of the central sarsen Trilithons. Source: Internet
Stonehenge 3 II (2600 BC to 2400 BC) Plan of the central stone structure today; after Johnson 2008 During the next major phase of activity, 30 enormous Oligocene Miocene sarsen stones (shown grey on the plan) were brought to the site. Source: Internet
They were placed within the outer sarsen circle and may have been trimmed in some way. Source: Internet
Within this circle stood five trilithons of dressed sarsen stone arranged in a horseshoe shape convert across with its open end facing north east. Source: Internet