n. [ Gr. &unr_; 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. ]
n. [ Gr. &unr_; 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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