At*trac"tion sphere.
1. (Zoöl.)
(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.
© Webster 1913