- a small or minute, slender, sharp-pointed body or part; a small, needlelike crystal, process, or the like.
- one of the small, hard, calcareous or siliceous bodies that serve as the skeletal elements of various marine and freshwater invertebrates.
- a jet of gas several hundred miles in diameter rising from the sun's surface to heights of 3,000 to 6,000 miles (4,800 to 9,600 km).
- a small slender pointed structure or crystal, esp any of the calcareous or siliceous elements of the skeleton of sponges, corals, etc
- a spiked ejection of hot gas occurring over 5000 kilometres above the sun's surface (in its atmosphere) and having a diameter of about 1000 kilometres
