P0439900 (pŏn′tə-nîr′)n. One who is in charge of pontoons or is engaged in the construction of pontoon bridges.[French pontonnier, from Old French, from ponton, pontoon; see pontoon.]
pontonier
(ˌpɒntəˈnɪə) or
pontonnier
n (Military) militaryobsolete a person in charge of or involved in building a pontoon bridge[C19: from French pontonnier, from Latin pontō ferry boat, pontoon1]