Lewis & Short

ambŭlātōrĭus, a, um, adj. [ambulator], that moves about (rare; never in Cic.); hence,

  1. I. Of machines which can be moved to and fro. movable: praeterea alias (so. turres) ambulatorias totidem tabulatorum confixerant, movable towers with an equal number of stories, Auct. B. Alex. 2 Moeb.; Vitr. 10, 19; Plin. 21, 14, 47, § 80.
    Hence, trop., of the will, wavering, fickle, changeable: voluntas, Dig. 24, 1, 32; and of other things: actio, a cause that passes from one to another, Cod. Just. 6, 2, 22.
  2. * II. Suitable for walking in: porticus, Dig. 8, 5, 8.