Lewis & Short

nōnāgēnārĭus, a, um, adj. [nonageni], that contains or consists of ninety.

  1. I. In gen.: nonagenarius motus stellae Martis, ninety degrees distant from the sun, Plin. 2, 15, 12, § 60: fistula, made of a sheet of lead ninety inches wide, Front. Aquaed. 60.
  2. II. In partic., as subst.: nōnā-gēnārĭus, i, m., a commander of ninety men, Inscr. Orell. 3628; cf. Veg. Mil. 2, 8.
  3. III. Ninety years old, Vulg. Gen. 17, 17.