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pontoon1

[pon-toon] /pɒnˈtun/
noun
1.
Military. a boat or some other floating structure used as one of the supports for a temporary bridge over a river.
2.
a float for a derrick, landing stage, etc.
3.
Nautical. a float for raising a sunken or deeply laden vessel in the water; a camel or caisson.
4.
a seaplane float.
Also, ponton
[pon-tn] /ˈpɒn tn/ (Show IPA)
.
Origin
1585-1595
1585-95; < French ponton < Latin pontōn- (stem of pontō) flat-bottomed boat, punt
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ponton

pontoon1

/pɒnˈtuːn/
noun
1.
  1. a watertight float or vessel used where buoyancy is required in water, as in supporting a bridge, in salvage work, or where a temporary or mobile structure is required in military operations
  2. (as modifier): a pontoon bridge
2.
(nautical) a float, often inflatable, for raising a vessel in the water
Word Origin
C17: from French ponton, from Latin pontō punt, floating bridge, from pōns bridge

pontoon2

/pɒnˈtuːn/
noun
1.
Also called (esp US) twenty-one, vingt-et-un. a gambling game in which players try to obtain card combinations worth 21 points
2.
(in this game) the combination of an ace with a ten or court card when dealt to a player as his first two cards
Word Origin
C20: probably an alteration of French vingt-et-un, literally: twenty-one
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ponton

pontoon

n.

"flat-bottomed boat" (especially one to support a temporary bridge), 1670s, from French pontoon, from Old French ponton (14c.) "bridge, drawbridge, boat-bridge; flat-bottomed boat," from Latin pontonem (nominative ponto) "flat-bottomed boat," from pons "bridge" (see pons). Pontoon bridge is first recorded 1778.

Online Etymology Dictionary, © 2010 Douglas Harper
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