Noun

1. A shallow pit or other edged depression in a road's surface, especially when caused by erosion by weather or traffic.
2. A pit formed in the bed of a turbulent stream.
   • Pothole - 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 first a natural depression of the rock. Webster 1913
   • The earliest ideas on the creation of potholes are that they were associated with "moulins de glacier" (glacier mills) formed where surface streams on glaciers and ice sheets fall into holes in the ice. Water entering these surficial holes was believed to impact on the bedrock beneath creating a large pothole. The "Moulin Hypothesis", first suggested in 1874, continued to be accepted by many authors until the 1950s. However, commencing in the 1930s, other authors have suggested dissatisfaction with the moulin hypothesis, largely on the grounds that it failed to explain how ice could remain stable long enough for the "giant" potholes to form and why many potholes (like those at Rockwood) were present in large numbers. Grand River Conservation Authority (Canada) Newsletter of May-June 2002.
3. A vertical cave system, often found in limestone.
4. A pit resulting from unauthorized excavation by treasure hunters or vandals. Term originates from the seeking of pots by digging.