'Centrosphere' definitions:

Definition of 'Centrosphere'

From: GCIDE

Centrosphere \Cen"tro*sphere\, n. [Gr. ? centre + sphere.]
1. (Geol.) The nucleus or central part of the earth, forming most of its mass; -- disting. from lithosphere, hydrosphere, etc. [Webster 1913 Suppl.]
2. (Biol.) The central mass of an aster from which the rays extend and within which the centrosome lies when present; the attraction sphere. The name has been used both as excluding and including the centrosome, and also to designate a modified mass of protoplasm about a centrosome whether aster rays are developed or not. [Webster 1913 Suppl.]