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The Collaborative International Dictionary of English v.0.48 (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.]

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