[{"Bold_text": "noun", "List Items": ["a small or minute, slender, sharp-pointed body or part; a small, needlelike crystal, process, or the like.", "Zoology.one of the small, hard, calcareous or siliceous bodies that serve as the skeletal elements of various marine and freshwater invertebrates.", "Astronomy.a jet of gas several hundred miles in diameter rising from the sun's to heights of 3,000 to 6,000 miles (4,800 to 9,600 km)."]}]