spongioblast
noun
spon·gi·o·blast
| \ ˈspən-jē-ō-ˌblast
, ˈspän-
\
, ˈspän-
\
Medical Definition of spongioblast
dated
: any of the ectodermal cells of the embryonic spinal cord or brain that are at first columnar but become branched at one end and were formerly thought to give rise to glial cells