A glioblast is a type of cell derived from neuroectoderm and with the ability to differentiate into several different types of neuroglia.
It comes from a precursor (spongioblast). However, the latter may also differentiate in ependymoblast.
The glioblast will differentiate in astrocyte and oligodendrocyte.
How to pronounce glioblast
References
Glioblast Wikipedia(Text) CC BY-SA