Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A ship having three decks, especially one of a class of sail-powered warships with guns on three decks.
 - noun Something with three levels or layers, as.
 - noun A three-story apartment building.
 - noun A sandwich having three slices of bread.
 
from The Century Dictionary.
- noun A vessel of war carrying guns on three decks; formerly, a line-of-battle ship, such ships being of that description in the sailing navy and the earlier naval classification after the introduction of steam.
 - Having three decks: as, a three-decker ship; hence, having three stories, tiers, or levels, as a piece of furniture or an old-fashioned pulpit.
 
from the GNU version of the Collaborative International Dictionary of English.
- noun (Naut.) A vessel of war carrying guns on three decks.
 
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun nautical  A sailing 
warship that had guns on each of three decks - noun   A 
sandwich made from three slices of bread; a triple-decker 
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a warship carrying guns on three decks
 - noun made with three slices of usually toasted bread
 - noun any ship having three decks
 
Etymologies
Sorry, no etymologies found.
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Examples
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Annie had lived with her Polish grandmother in another dingy three-decker on the next corner.
Lipstick in Afghanistan Roberta Gately 2010
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The huge three-decker Sky Queen, a completely equipped flying laboratory, had been Tom's first major invention.
Golden State 2010
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Later that afternoon I turned ontoPearl Streetand noticed a woman smoking on the first floor of a three-decker tenement.
FIREWORKS Norman Klein 2010
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Would you like arsenic sauce with your three-decker sauerkraut and toadstool sandwich?
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But he did not seem to notice, and instead launched into an account of how he had that morning read and reviewed four three-decker novels without cutting a single page, delivered his copy, and sold all four in pristine condition in Fleet Street in time for lunch.
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The lad had volunteered — along with two of his mates from the HMS Excellent, Second Lieutenant Hodgson and First Mate Hornby — but the Excellent was a damned three-decker that was old before Noah had fuzz around his dongle.
The Terror Simmons, Dan 2007
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It's hard to imagine that any contemporary novelist could have appropriated with such skill and force the irresistible narrative drive of the Victorian three-decker, or that readers who hunger for story won't devour this like grateful wolves.
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And the market, especially towards the end of the century, was for what are known as three-decker novels.
December 2004 Michael Allen 2004
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And the market, especially towards the end of the century, was for what are known as three-decker novels.
Archive 2004-12-01 Michael Allen 2004
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French three-decker of the old type, moored higher up, serves as an hospital.
The Golden Chersonese and the way thither Isabella Lucy 2004
 
reesetee commented on the word three-decker
A sail warship carrying guns on three fully armed decks. Usually additional guns were carried on the upper works (forecastle and quarterdeck), but this was not a continuous battery, so these did not count. Three-deckers were usually ships of the line, classed as first-rate or second-rate.
OR: You can go with a sandwich made of three slices of usually toasted bread, but you're likely to lose the war.
December 4, 2007