[spuhn-jee-oh-blast, spon-]
noun Embryology.
one of the primordial cells in the embryonic brain and spinal cord capable of developing into neuroglia.

1900–05; spongio- (combining form of Greek spongiā́ sponge) + -blast

spongioblastic, adjective
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World English Dictionary
spongioblast (ˈspʌndʒɪəʊˌblɑːst)
any of numerous columnar epithelial cells in the brain and spinal cord that develop into neuroglia
[C20: from Greek spongiasponge + -blast]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

spongioblast spon·gi·o·blast (spŭn'jē-ə-blāst')
An embryonic epithelial cell that gives rise to the neuroglia.

The American Heritage® Stedman's Medical Dictionary
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