From mesectoderm + -al. <span class="searchmatch">mesectodermal</span> (not comparable) (embryology) Relating to the mesectoderm. 1904, Ross Graville Harrison, Reprints of Articles on...
From meso- + ectoderm. mesectoderm (plural mesectoderms) The region involved in the separation of mesoderm and ectoderm <span class="searchmatch">mesectodermal</span>...