n. [ F. ponton (cf. It. pontone), from L. ponto, -onis, fr. pons, pontis, a bridge, perhaps originally, a way, path: cf. Gr. &unr_; path, Skr. path, pathi, panthan. Cf. Punt a boat. ]
Pontoon bridge,
Pontoon train,
☞ The French spelling ponton often appears in scientific works, but pontoon is more common form. [ 1913 Webster ]
n. The act, art, or process of constructing pontoon bridges. “Army instruction in pontooning.” Gen. W. T. Shermah. [ 1913 Webster ]