n. An organelle, near the nucleus in the cytoplasm of most organisms, that controls the organization of its microtubules
the GNU version of the Collaborative International Dictionary of English
n. 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.
The Century Dictionary and Cyclopedia
n. In cytology, a body of indeterminate nature in the center of each astrosphere of the dividing-cell.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. small region of cytoplasm adjacent to the nucleus; contains the centrioles and serves to organize the microtubules
Word Usage
"In the middle of the centrosome is a minute body called the centriole, and surrounding this is a clear spherical mass known as the centrosphere."