decanonus Save DMLBS decanonus , metri gratia for decimus nonus.. 13‥ ter triples ternam senam denam decanonam / sic cito percipies urbs tua quare ruit (Vers.) Map NC [ed. James] app. p. 260 (cf. ib. 261: littera decimanona); Elmh. Metr. Hen. V 53 (v. decaquartus).