An anti skid system is a blank system.

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Anti-skid braking relies on electronically sensing wheel speed and quickly modulating the actual braking force using hydraulic power. The system combines electronic control with hydraulic actuation: wheel-speed sensors feed data to a brake control unit, which then commands hydraulic valves to increase or release pressure at each brake to keep wheels from locking. That blend of electronic processing and hydraulic power makes it an electro-hydraulic system.

A purely hydromechanical setup wouldn’t have electronic processing to modulate pressure based on wheel slip, and a purely pneumatic or electrical system wouldn’t provide the necessary hydraulic braking pressure that anti-skid requires. The electrical part handles sensing and control logic, while the hydraulic part provides the actual braking force, so electro hydraulic is the correct description.