the outermost layer of the cuticular protoplasm of some Protozoa (cf. ectoplasmn., endoplasmn. at endo-prefix and comb. form, s.v. ecto-comb. form.). [After German Exoplasma (1872 in Haeckel).]
ΚΠ
1888 Athenæum 4 Feb. 151/1 The granulated structure of its exoplasm..was described.