Word Study
sarsen
CIDE DICTIONARY
sarsen, n. [Etymol. uncertain; perhaps for saracen stone, i.e., a heathen or pagan stone or monument.].
One of the large sandstone blocks scattered over the English chalk downs; -- called also sarsen stone , and Druid stone . [1913 Webster]
OXFORD DICTIONARY
sarsen, n. Geol. a sandstone boulder carried by ice during a glacial period.
Etymology
prob. var. of SARACEN
For further exploring for "sarsen" in Webster Dictionary Online