mesectoderm
/mɛsˈɛktə(ʊ)dəːm/ /mɪˈsɛktə(ʊ)dəːm/ /mɛzˈɛktə(ʊ)dəːm/Embryology
noun
Mesenchyme that is derived from ectoderm or the neural crest rather than from mesoderm. Also: the outer layer of blastoderm before its differentiation into ectoderm and mesoderm.
Origin
Late 19th century; earliest use found in Journal of the Royal Microscopical Society. From German Mesektoderm from Meso- + Ektoderm.