Source : Webster's Revised Unabridged Dictionary (1913)

Centrosome \Cen"tro*some`\, n. [Gr. ? center + -? the body.]
   (Biol.)
   A peculiar rounded body lying near the nucleus of a cell. It
   is regarded as the dynamic element by means of which the
   machinery of cell division is organized.

Source : WordNet®

centrosome
     n : small region of cytoplasm adjacent to the nucleus; contains
         the centrioles and serves to organize the microtubules
         [syn: {central body}]