Definition of mesendoderm in US English:

mesendoderm

noun

Embryology
  • Mesenchyme that is derived from endoderm rather than from mesoderm. Also: the inner layer of blastoderm before its differentiation into endoderm and mesoderm.

Origin

Late 19th century; earliest use found in Journal of the Royal Microscopical Society. From meso- + endoderm, after German Mesentoderm mesentoderm.