Search Result for "actuator": 
Wordnet 3.0

NOUN (1)

1. a mechanism that puts something into automatic action; 



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]


WordNet (r) 3.0 (2006):

actuator
    n 1: a mechanism that puts something into automatic action