an airplane with three supporting wings, one above another: a design used mainly in the early history of the airplane.

1905–10; tri- + plane1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
triplane (ˈtraɪˌpleɪn)
an aeroplane having three wings arranged one above the other

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Anyway, the old cars, and the biplane and triplane in an airplane sequence are fun.
They measured monoplane, biplane, and triplane wing models.
It may be used to better define pilon fractures or triplane fractures.
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