triplane

[ trahy-pleyn ]
/ ˈtraɪˌpleɪn /

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

Origin of triplane

First recorded in 1905–10; tri- + plane1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for triplane

triplane

/ (ˈtraɪˌpleɪn) /

noun

an aeroplane having three wings arranged one above the other
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