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.
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Whole.
Open English WordNet identifies the related term as a broader lexical category for at least one sense.
Having an empty space or cavity, natural or artificial, within a solid substance; not solid; excavated in the interior; as, a hollow tree; a hollow s…
Open English WordNet identifies the related term as a broader lexical category for at least one sense.
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