or con·vert·a·plane, con·vert·o·plane
an airplane capable of both vertical flight like a helicopter and fast, forward speed like a conventional airplane.
Origin of convertiplane
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
convertaplane or convertoplane
an aircraft that can land and take off vertically by temporarily directing its propulsive thrust downwards
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