
1) Aircraft control 2) Aircraft control surface 3) Hinged flap on an airplane
Found on
https://www.crosswordclues.com/clue/elevon

Elevons are aircraft control surfaces that combine the functions of the elevator (used for pitch control) and the aileron (used for roll control), hence the name. They are frequently used on tailless aircraft such as flying wings. An elevon that is not part of the main wing, but instead is a separate tail surface, is a stabilator (but stabilators ...
Found on
http://en.wikipedia.org/wiki/Elevon

A hinged device on the rear portion of an aircraft wing combining the functions of an elevator and an aileron. Usually found on delta-wing aircraft, it can be moved in the same direction on either side of the aircraft to obtain longitudinal control, or differentially to obtain lateral control. Also see FLAPERON.
Found on
http://www.aerofiles.com/glossary.html

A control surface on a delta-winged aircraft, such as the Space Shuttle or Concorde, that combines the functions of an aileron and an elevator, controlling roll (motion about the longitudinal axis) and pitch (motion about the lateral axis).
Found on
http://www.daviddarling.info/encyclopedia/E/elevon.html

An elevator split into 2 halves which can be operated independently so that the same control surfaces can be used to control the roll of an aircraft as well as the pitch Often seen on Flying Wings and Delta planform models
Found on
http://www.encyclo.co.uk/local/22135

Movable control surfaces which act collectively as elevators, but differentially as ailerons. See also: Aileron, Aircraft, Elevator.
Found on
https://www.encyclo.co.uk/local/20687

A hinged device on the rear portion of an aircraft wing combining the functions of an elevator and an aileron. Usually found on delta-wing aircraft, it can be moved in the same direction on either side of the aircraft to obtain longitudinal control, or differentially to obtain lateral control. Also see FLAPERON.
Found on
https://www.encyclo.co.uk/local/22323

a control surface functioning both as an elevator and as an aileron.
Found on
https://www.infoplease.com/dictionary/elevon
No exact match found.