\At*trac"tion sphere\
1. (Zo["o]l.)
   (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.