Real Dictionary

menhir in American English
a tall, usually rough, upright megalith, probably erected as a Neolithic monument either alone or as part of a row or circle
noun: an upright monumental stone standing either alone or with others, as in an alignment, found chiefly in Cornwall and Brittany

menhir in British English
noun: a single standing stone, often carved, dating from the middle Bronze Age in the British Isles and from the late Neolithic Age in W Europe