Definition of "airbrake"

airbrake

noun
plural airbrakes
1. A brake (slowing device) that is operated pneumatically (by air pressure).
  Quotations
  These VEAs (of which some 550 were built in total) would themselves have been converted from 1962 vanwides, refurbished and fitted with airbrakes specifically with Ministry of Defence munitions traffic in mind, as many military establishments and depots would have had track too sharply curved for newer airbraked wagons.
  2022 January 12, Chris Hegg, “The secret railway in the woods”, in RAIL, number 948, page 37
2. (aviation) A movable control surface that extends to increase drag without affecting lift (unlike a spoiler); a device that provides aerodynamic braking.