Centrosphere
Centrosphere , noun
[Greek {not transcribed} centre + sphere.]
1.
(Geology) The nucleus or central part of the earth, forming most of its mass; -- disting. from lithosphere, hydrosphere, etc.
2.
(Biology) 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.