| Mesoderm 1. (n.) The layer of the blastoderm, between the ectoderm and endoderm; mesoblast. See Ectoderm. 2. (n.) The middle body layer in some invertebrates. 3. (n.) The middle layer of tissue in some vegetable structures. Thesaurus Entries Leatherette, Leatheroid, blastoderm, coat, corium, cuticle, cutis, cutis vera, derma, ectoblast, ectoderm, endothelium, entoderm, epiblast, epidermis, epithelium, fell, fleece, flesh, fur, furring, hide, hypodermis, imitation fur, imitation leather, integument, jacket, leather, leather paper, mesoderm, outer layer, outer skin, pavement epithelium, pelt, peltry, rawhide, rind, scarfskin, sheath, skin, skins, tegument, true skin, vair |