margaritaceous,a.Nat.Hist.|mɑːgərɪˈteɪʃəs| [f.mod.L. margarītāceus, f.margarīta: see -aceous.] Pearly. 1826Kirby & Sp.Entomol. IV. 282 Margaritaceous... Glossy white with changeable tints of purple, green, and blue.1842Johnston in Proc.Berw.Nat. Club II. No. 10. 35 Shell cinereous,..interior magaritaceous.