a plane capable of both vertical flight like a helicopter and fast, forward speed like a conventional airplane.
Also, convertaplane, convertoplane.

1945–50; convert + -i- + plane1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
convertiplane, convertaplane or convertoplane (kənˈvɜːtəˌpleɪn)
an aircraft that can land and take off vertically by temporarily directing its propulsive thrust downwards
convertaplane, convertaplane or convertoplane
convertoplane, convertaplane or convertoplane

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences for convertiplane
A convertiplane is a fixedwing aircraft capable of vertical takeoff and landing.
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