nōnus — Lewis & Short
nōnus, a, um,
terra nona,Cic. Rep. 6, 18, 18:
accedes opera agro nona Sabino,Hor. S. 2, 7, 118.—
post nonam venies,Hor. Ep. 1, 7, 71; Mart. 4, 8, 5.—
nonas praedae vovere,Just. 20, 3, 3.—Hence, adv.: nōnō, ninthly, Cassiod. de Anim. 12.