Servo-motor

·add. ·noun A relay apparatus;.

II. Servo-motor ·add. ·noun In a Whitehead torpedo, a compressed-air motor, for moving the rudders so as to correct deviations from the course.

III. Servo-motor ·add. ·noun An auxiliary motor, regulated by a hand lever, for quickly and easily moving the reversing gear of a large marine engine into any desired position indicated by that of the hand lever, which controls the valve of the motor.