0 a tall stone put in a vertical position by people in prehistoric times (= the period before there were written records):
Everyone has a theory about these mysterious, giant standing stones.
the 5,000-year-old circle of standing stones at Avebury in Wiltshire, England
Five-thousand-year-old megalithic tombs and standing stones litter the landscape.
The earliest settlers left behind them a remarkable array of monuments: standing stones, burial chambers, villages.
English Heritage cares for over 350 ancient monuments from the smallest standing stones to the largest fortresses.
