power steering

noun Automotive.
an automotive steering system in which the engine's power is used to supplement the driver's effort in turning the steering wheel.

Origin:
1930–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
power steering
 
n
Also called: power-assisted steering a form of steering used on vehicles, where the torque applied to the steering wheel is augmented by engine power

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

power steering

system to aid the steering of an automobile by use of a hydraulic device (driven from the engine) that amplifies the turning moment, or torque, applied to the steering wheel by the driver. To reduce the torque required from the driver as cars became heavier and tires softer, gears were introduced between the steering wheel shaft and the linkage that turns the wheels. The gears multiplied the torque supplied by the driver to a much greater torque on the shaft that drives the front wheels to right or left. A disadvantage arose, however, in the higher steering ratio required; i.e., amount of turn of the steering wheel needed.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The electric power steering and regenerative-braking system don't provide much
  feedback, though.
Our only complaint is the power steering is a bit numb.
The electric power steering provides decent feel and feedback, though it is a
  bit slow.
Already, they've pulled off all parts that would be extraneous at sea, such as
  the power steering pump.
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