ametabolian,a.andn.Zool.|əˌmɛtəˈbəʊlɪən| [f.prec. + -ian: cf.agamian.] A.adj. Belonging to the Ametabola. B.n. An insect of this sub-class. 1835Kirby Habits & Inst. An. II. xiv. 18 Dr. Leach divides Insects into Ametabolians and Metabolians.1875Blake Zool. 243 Diœcious and ametabolian.