Centrosphere

1 definition found

From 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.]