Lewis & Short

Vĭtellĭus, i, m., the name of a Roman gens. So esp., A. Vitellius, a Roman emperor.
Hence,

  1. A. Vĭtellĭus, a, um, adj., of or belonging to the emperor Vitellius, Vitellian: via, so named after him, Suet. Vit. 1; Tac. H. 1, 1; 1, 57.
  2. B. Vĭtellĭānus, a, um, adj., of or belonging to Vitellius, Vitellian: milites, Tac. H. 1, 85: partes, id. ib. 1, 84: bellum, Suet. Dom. 1: vitia, Capitol. Ver. 4.
    1. 2. Plur. subst.: Vĭtellĭāni, ōrum, m.
      1. a. Soldiers of Vitellius, Vitellians, Tac. H. 3, 79; Suet. Vesp. 8.
      2. b. A kind of writing-tablets, perh. used by Vitellius, Mart. 2, 6, 6; 14, 8, 2; 14, 9 in lemm.