Real Dictionary

henge in American English
a Neolithic or Bronze Age monument of the British Isles, consisting of a circular bank or ditch enclosing, variously, stone or timber uprights, burial pits, etc.
noun: a Neolithic monument of the British Isles, consisting of a circular area enclosed by a bank and ditch and often containing additional features including one or more circles of upright stone or wood pillars: probably used for ritual purposes or for marking

henge in British English
noun: a circular area, often containing a circle of stones or sometimes wooden posts, dating from the Neolithic and Bronze Ages