noun Aeronautics.

a convertiplane capable of taking off and landing vertically, having forward speeds comparable to those of conventional aircraft.

Origin of VTOL

1965–70; v(ertical) t(ake)o(ff and) l(anding)
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British Dictionary definitions for vtol



vertical takeoff and landing; a system in which an aircraft can take off and land vertically
an aircraft that uses this systemCompare STOL
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