Lewis & Short

vexillārĭus, ii, m. [vexillum].

  1. I. A standard-bearer, ensign.
    1. A. Lit., Liv. 8, 8, 4; Tac. H. 1, 41.
    2. B. Transf., a leader, captain of a band of robbers, App. M. 4, p. 146.
  2. II. vexillārĭi, ōrum, m., in the times of the emperors, the oldest class of veterans, the last summoned, Tac. A. 1, 38; id. H. 2, 83; 2, 100; Veg. Mil. 2, 110 fin. al.