Definition of jetavator in English:

jetavator

Pronunciation /ˈdʒɛtəveɪtə/

noun

(also jetevator)
  • A control surface which can be moved into the exhaust gases of a rocket in order to change the direction of thrust.

Origin

1960s; earliest use found in The Aeroplane. From jet + -avator, alteration of -evator.