actuator

from WordNet (r) 3.0 (2006)
actuator
    n 1: a mechanism that puts something into automatic action
    
from The Collaborative International Dictionary of English v.0.48
Actuator \Ac"tu*a`tor\, n.
   One who actuates, or puts into action. [R.] --Melville.
   [1913 Webster]
    

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