endomesoderm

noun
en·do·me·so·derm | \ˌen-dō-ˈmez-ə-ˌdərm, -ˈmēz-, -ˈmēs-, -ˈmes-\

Medical Definition of endomesoderm 

: an embryonic blastomere or cell layer not yet differentiated into mesoderm and endoderm but destined to give rise to both

called also mesendoderm

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