myelospongium
noun
my·e·lo·spon·gi·um
| \ ˌmī-ə-lō-ˈspän-jē-əm, -ˈspən-
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plural myelospongia\ -jē-ə
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Medical Definition of myelospongium
dated
: a network in the embryonic central nervous system derived from the spongioblasts and giving rise to the glia