centrosome
noun
- structure made of a core (usually 2 centrioles) and peripheral material from which a microtubule-based structure (e.g. spindle apparatus) is organized, occurring close to the nucleus during interphase
Wiktionary
noun
Etymology: From centro- + -some.
- An organelle, near the nucleus in the cytoplasm of most organisms, that controls the organization of its microtubules.