The Collaborative International Dictionary
Centrosphere
Centrosphere \Cen"tro*sphere\, n. [Gr. ? centre + sphere.]
(Geol.) The nucleus or central part of the earth, forming most of its mass; -- disting. from lithosphere, hydrosphere, etc.
(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.
Wiktionary
centrosphere
n. 1 (context biology English) The cytoplasm surrounding the centriole of a centrosome. 2 (context geology English) barysphere