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An airplane with wings placed above each other in three levels.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Aeronautics) an aeroplane having three wings arranged one above the other
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


an airplane with three sets of wings.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


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Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
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What if those leading these nations forward felt that Sopwith Camels and Fokker triplanes engaging each other in ter-rifying dogfights, as millions of troops ploughed their way through the squelching mud below, alongside the metallic clanking of tanks and the thundering of cannon, wasn't enough to win a war?
Charles, visitors will be able to watch scale-model RAF Sopwith Camels and Sopwith Pups do battle with Fokker biplanes and triplanes like the one "Red Baron" Manfred von Richthofen died in three weeks after the RAF was created.
The Italians were also developing their own heavy-bomber force using big Caproni biplanes and triplanes with Fiat engines.
The book has nineteen chapters, each dealing with a sub-era of the two world wars and the years between: the earliest fighters 1914-16; Halberstadt and Albatros biplane scouts, 1916-17; fighter development 1916-17; Sopwith and Fokker Dr.1 triplanes; fighters of 1918; fighters of the Spanish Civil War 1936-39; European fighters 1930-41; Hurricane and Spitfire 1930-41; Japanese Fighters 1937-41; licensed and leased Fighters 1939-42; American fighters 1941-43; Fulmar and Firefly 1940-44; German, Italian, and Japanese Fighters, 1941-44; Soviet fighters 1941-44; F4U and F6F 1943; cannon-armed fighters 1940-44; night fighters 1940-44; improvisations and developmental dead-ends 1940-45; and Me 262, Meteor, and P-80 1944-45.
The metal is embossed with images including triplanes, crocodiles, lions, elephants, and the EIIR royal cypher.
It resembled the old film Those Magnificent Men in Their Flying Machines, about a 1910 air race from London to Paris, in which a collection of extremely weird pilots in ramshackle biplanes and triplanes took turns being briefly in the lead and then crashed and burned.
One was devoted to 'Airplanes' and illustrated with photographs of early biplanes and triplanes, with their wings connected by struts.
Envisioning biplanes and triplanes, and the loutish chivalry practiced aboard them, I reassured him that I would be above that awful ground, in the air with the best of them, at which he looked somehow disappointed, but he was more than glad when, ready for my tutorial in military history, I came downstairs garbed in a brown blazer festooned with leatherette straps filched from a cowboy outfit and some military badges begged from soldiers who had passed through the village on their way to yet another war.