Final answer:
Glioblastoma is the tumor of star-shaped glial cells in the central nervous system. It is a malignant tumor that arises from astrocytes.
Step-by-step explanation:
The tumor of star-shaped glial cells, malignant in higher grades, is called Glioblastoma. Glioblastoma is a type of astrocytoma, which is a tumor that arises from astrocytes, a type of glial cell. These tumors are often aggressive and difficult to treat.