Cydraulic

Cydraulics are a component of Cybertronian anatomy.

We encapsulate an ideal, [...] But scratch the surface... and we are just metal and cydraulics.Optimus Prime contemplates his own fallibility, Spotlight: Optimus Prime

Fiction

2005 IDW continuity

On the planet Nebulos, Ultra Magnus recognized the combination of servos, trauma-buffers, and cydraulics within an augmented Nebulan as Cybertronian technology. Spotlight: Ultra Magnus

Notes

• "Cydraulics" is a real, albeit obscure term used for certain high-performance metal presses and braking systems where the pressures involved cause heat to build-up at a rate faster than it would normally disperse. In this case, however, it's probably just a portmanteau of "cyber"/"Cybertronian" and "hydraulics".