convertiplane(redirected from convertible helicopter)
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con·vert·i·planealso con·vert·a·plane (kən-vûr′tə-plān′)
An airplane having the ability to take off and land vertically, as by the use of large propellers that tilt upward to provide thrust.
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 aircraft that can land and take off vertically by temporarily directing its propulsive thrust downwards
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
an aircraft capable of vertical flight like a helicopter and forward flight like a conventional airplane.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.