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spicule spic·ule (spĭk'yōōl) or spic·u·la (-yə-lə)
n. pl. spic·ules or spic·u·lae (-yə-lē)
A needlelike structure or part.
a jet of dense gas ejected from the Sun's chromosphere. Spicules occur at the edges of the chromospheric network, where magnetic fields are stronger. They extend up to 10,000 km (6,000 miles) and, although they fall back to the Sun, are thought to contribute to the solar wind by feeding material into the corona