Synonyms: cave
Definition: a geological formation consisting of an underground enclosure with access from the surface of the ground or from the sea
Similar words: geological formation, formation
Definition: (geology) the geological features of the earth
Definition: explore natural caves
Similar words: explore
Definition: travel to or penetrate into
Usage: explore unknown territory in biology
Definition: hollow out as if making a cave or opening
Usage: The river was caving the banks
Similar words: core out, hollow, hollow out
Definition: remove the interior of
Usage: hollow out a tree trunk