centrosphere

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The mass of cytoplasm surrounding the centriole in a centrosome.
• noun The central part of the earth, usually the part beneath the lithosphere but sometimes the part beneath the mantle.

from The Century Dictionary.

• noun In cytology, a spherical, differentiated mass of cytoplasm surrounding the centrosome and constituting a pole of the karyokinetic spindle during cell-division. Also called attraction-sphere.
• noun The central or interior portion of the earth, beginning at a somewhat indefinite depth, and involving materials and pressures of which we have no actual experience; contrasted with the successive outer shells, lithosphere, hydrosphere, and atmosphere.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Geol.) The nucleus or central part of the earth, forming most of its mass; -- disting. from lithosphere, hydrosphere, etc.
• noun (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun biology The cytoplasm surrounding the centriole of a centrosome.
• noun geology barysphere