Wiktionary
pneudraulics
n. 1 The system on military aircraft that use either or some combination of both hydraulic and pneumatic systems. 2 The science of fluids made of both gas and liquid.
Wikipedia
Pneudraulics
Derived from the words hydraulics and pneumatics, pneudraulics is the term used when discussing systems on military aircraft that use either or some combination of hydraulic and pneumatic systems. Sometimes, land tractors will have pneumatic tires and hydraulic shovels.