the outer layer of the blastoderm; = ectodermn. at ecto-comb. form; also, the external crust of the body of an insect. [Compare scientific Latin exoderma (1828), French exoderme (1834 or earlier), both denoting the external crust of the body of an insect, and German Exoderm ectoderm (1872 or earlier).]
ΚΠ
1879 tr. E. Haeckel Evol. Man I. viii. 197 The protoplasm of the exoderm cells.