( n. )
A circular hole formed in the rocky beds of rivers by the grinding action of stones or gravel whirled round by the water in what was at first a natural depression of the rock.
( n. )
A circular hole formed in the rocky beds of rivers by the grinding action of stones or gravel whirled round by the water in what was at first a natural depression of the rock.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012