Karyaster refers to the bundle of microtubules that form during cell division, helping to separate chromosomes. There are several synonyms that can be used to refer to karyaster, including spindle fibers, mitotic spindle, and microtubule spindle. These terms are all related to the structure and function of the karyaster. The spindle fibers are composed of microtubules that help to move chromosomes towards the poles of the cell during mitosis, and the mitotic spindle forms the framework around which the spindle fibers are arranged. Microtubule spindle helps to describe the organization of the microtubules within the karyaster. All of these synonyms can be used to better understand the process of cell division.