spongioblast

noun
spon·gi·o·blast | \ ˈspən-jē-ō-ˌblast , 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

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