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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.

rge African heron (Ardeomega goliath). It is the largest heron known. -- Giant kettle, a pothole of very large dimensions, as found in Norway in connection with glaciers. See Pothole. -- Giant powder. See Nitroglycerin. -- Giant puffball (Bot.), a fungus (Lycoperdon giganteum), edible when young, and when dried used…