The Collaborative International Dictionary
Attraction sphere \At*trac"tion sphere\
The central mass of the aster in mitotic cell division; centrosphere.
Less often, the mass of archoplasm left by the aster in the resting cell.
(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.