There are 2 definitions of pontoon in English:

pontoon1

Syllabification: pon·toon
Pronunciation: /ˌpänˈto͞on
 
/

noun

1A flat-bottomed boat or hollow metal cylinder used with others to support a temporary bridge or floating landing stage.
More example sentences
  • A floating pontoon bridge links each side of the city but this has been relegated to pedestrian traffic since they built a spectacular motorway road bridge, which now dominates the skyline.
  • During a 30-hour river closure, winch wires were being secured to both banks of the river and used to tow the floating pontoon on which the bridge rested.
  • Floating pontoons, with their massing and design, ‘cannot contribute in the same way and constitute an intrusive feature in such a sensitive location’.
1.1A bridge or landing stage supported by pontoons.
More example sentences
  • If true, this could persuade the EU to pay for a Hungarian operation to lift the wreckage - and possibly for a high-level bridge to replace the Novi Sad pontoon.
  • We trundled off, hiked up a steep incline of jagged coral, past poisonous trees and cat-sized frogs, and ended up at an unprepossessing wooden pontoon at the edge of a vast lake.
  • He sets up a typewriter on a rickety wooden pontoon and moodily bashes away, staring out over the lake.
1.2A large flat-bottomed barge or lighter equipped with cranes.
More example sentences
  • The Port Service's crane toppled as the Able Seaman was lifting a steel workbench from the tray of a semi-trailer on to a pontoon being used for maintenance work on the sail training ship Young Endeavour.
  • As this edition of Navy News was going to press a number of pontoons and moorings were being secured to the seabed around the warship.
  • Aqis spokeswoman Jen O'Reilly said the consignment also included a tug, pontoons, cranes, forklift and anchor.
1.3Either of the floats fitted to an aircraft to enable it to land on water.
More example sentences
  • Up to that point, the aircraft flew with pontoons for water landings, but those were replaced by wheels for the flight across the Asian subcontinent and thence to France and the United Kingdom.
  • With drag from pontoons and floats removed, the OS2Us had greater speed and could carry heavier loads of bombs.
  • While waiting for help to arrive, the crew haggled with missionary priests for wine, rice and yams, and struggled to keep curious natives off the pontoons used for water landings.

Origin

late 17th century: from French ponton, from Latin ponto, ponton-, from pons, pont- 'bridge'.

Definition of pontoon in:

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Word of the day humoresque
Pronunciation: ˌ(h)yo͞oməˈresk
noun
a short, lively piece of music

There are 2 definitions of pontoon in English:

pontoon2

Syllabification: pon·toon
Pronunciation: /
 
ˌpänˈto͞on/

noun

British
1The card game blackjack or vingt-et-un.
More example sentences
  • In blackjack, or pontoon as it is known in Britain, the aim is to get a hand that totals 21, or as near 21 as possible without going over.
  • Before Mrs Bs arrived, I was playing pontoon with Kerstie.
  • These are useful in many ways, not least as a betting tokens for playing pontoon, we've found!
1.1A hand of two cards totaling 21 in the card game pontoon.
More example sentences
  • If the banker does not have a pontoon then, beginning with the player to dealer's left and continuing clockwise, the players each have a turn to try to improve their hand if they wish by acquiring extra cards.
  • If no one had a Pontoon, the dealer adds all the used cards to the bottom of the pack and without shuffling deals a new hand.

Origin

early 20th century: probably an alteration of vingt-et-un 'twenty-one'.

Definition of pontoon in: