pontoon

• IPA^(key): /pɒnˈtuːn/

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Borrowed from Old French ponton, from Latin pontō, pontōnem (“ferryboat”), from pōns (“bridge”).

pontoon (plural pontoons)

1. (military) A flat-bottomed boat used as a support for a temporary bridge.
2. A floating structure supporting a bridge or dock.

   Synonym: pontoon bridge

3. A box used to raise a sunken vessel.
4. A float of a seaplane.
5. A lighter or barge used for loading or unloading ships.

Probably from vingt-un, an obsolete variant of vingt-et-un (“twenty-one”), from French.

pontoon (uncountable)

1. (card games) A card game in which the object is to obtain cards whose value adds up to, or nearly to, 21 but not exceed it.

   Synonym: vingt-et-un

• baccarat
• blackjack
• twenty-one