Lewis & Short

ponto, ōnis, m. [1. pons].

  1. I. A kind of Gallic transport, a punt, Caes. B. C. 3, 29.
  2. II. A floating bridge, a pontoon, Aus. Idyll. 12, 10; Dig. 8, 3, 38; Gell. 10, 25, 5.