ectomeninx

noun
ec·​to·​meninx | \¦ektō+\
plural ectomeninges

Definition of ectomeninx 

: the layer of mesoderm from which the dura mater and much of the membrane bone of the skull develop in the higher vertebrate embryo

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History and Etymology for ectomeninx

New Latin, from ect- + Greek mēninx membrane

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