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From: Webster's Revised Unabridged Dictionary (1913)

 At·trac·tion sphere.
 1. Zool. (a) The central mass of the aster in mitotic cell division; centrosphere. (b) Less often, the mass of archoplasm left by the aster in the resting cell.
 2.  Bot. A small body situated on or near the nucleus in the cells of some of the lower plants, consisting of two centrospheres containing centrosomes. It exercises an important function in mitosis.