[{"Bold_text": "noun", "List Items": ["a curve; bend.", "a curving part or recess.", "Anatomy.any of various cavities, recesses, or passages, as a hollow in a bone, or a reservoir or channel for venous blood.one of the hollow cavities in the skull connecting with the nasal cavities.an expanded area in a canal or tube.", "any of various cavities, recesses, or passages, as a hollow in a bone, or a reservoir or channel for venous blood.", "one of the hollow cavities in the skull connecting with the nasal cavities.", "an expanded area in a canal or tube.", "Pathology.a narrow passage leading to an abscess or the like.", "Botany.a small, rounded depression between two projecting lobes, as of a leaf."]}]