endomeninx
noun
en·do·me·ninx
ˌen-də-ˈmē-niŋ(k)s
-ˈmen-iŋ(k)s
plural endomeninges
-mə-ˈnin-(ˌ)jēz
: the layer of embryonic mesoderm from which the arachnoid coat and pia mater of the brain develop
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Merriam-Webster unabridged
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