jetavator

jet·a·va·tor

 (jĕt′ə-vā′tər)
n.
A control surface that may be moved into the propulsion stream of a rocket in order to change the direction of thrust.

[jet + alteration of (el)evator.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.