Definition of "pontoon" [pon•toon]

• A floating structure, such as a flatbottom boat, that is used to support a bridge. (noun)
• A floating structure serving as a dock. (noun)
• A float on a seaplane. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The party boat is what we called the pontoon boat."
• "It could very well have been "pontoon" on a different day."
• "Other games are "crown and anchor", which is a dice game, and "pontoon", which is a card game similar to "twenty-one" or "seven and a half.""