[soo-per-gran-yuh-ley-shuh n] /ˌsu pərˌgræn yəˈleɪ ʃən/
noun, Astronomy.
one of a number of large convection cells in the photosphere and chromosphere of the sun, each having a diameter of 10,000–20,000 miles (16,000–32,000 km) and lasting longer than a day.


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