Lewis & Short

rŏtābĭlis, e, adj. [rota].

  1. I. Whirling, rotary (late Lat.): flexus, Amm. 23, 4, 2.
  2. II. Transf., of a road, practicable: VIAM INVIAM ROTAB. REDD., Inscr. Grut. 149, 1.