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 are also used for pitch control only, with no roll function, as on the Piper Cherokee series of aircraft). The word "elevon" is a
portmanteau of
elevator and ailer
on.