Webster's English Dictionary

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servomotor

ser.vo.mo.tor \'s*r-vo--.mo-t-*r\ n [F servo-moteur, fr. L servus slave, 
   servant + F -o- + mot]eur motor, fr. L motor one that moves - more at MOTOR 
   : a power-driven mechanism that supplements a primary control operated by  
   a comparatively feeble force (as in a servomechanism)