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