[{"Bold_text": "noun", "List Items": ["small stones and pebbles, or a mixture of these with sand.", "Pathology.multiple small calculi formed in the kidneys.the disease characterized by such concretions.", "multiple small calculi formed in the kidneys.", "the disease characterized by such concretions."]}, {"Bold_text": "verb (used with object)", "List Items": ["to cover with gravel.", "to bring to a standstill from perplexity; puzzle.", "Informal.to be a cause of irritation to.", "Obsolete.to run (a ship) aground, as on a beach."]}, {"Bold_text": "adjective", "List Items": ["harsh and grating:a gravel voice."]}]