endomesoderm
noun
en·do·me·so·derm
ˌen-dō-ˈmez-ə-ˌdərm
-ˈmēz-
-ˈmēs-,
-ˈmes-
: 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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Merriam-Webster unabridged
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