mesendoderm development
The process whose specific outcome is the progression of the mesendoderm over time, from its formation to the mature structure. In animal embryos, mesendoderm development gives rise to both mesoderm and endoderm tissues.
GO:0048856
anatomical structure development
is_a
GO:0007492
endoderm development
part_of
GO:0007498
mesoderm development
part_of