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From The Collaborative International Dictionary of English v.0.48:
Graduator \Grad"u*a"tor\, n. 1. One who determines or indicates graduation; as, a graduator of instruments. [1913 Webster] 2. An instrument for dividing any line, right or curve, into small, regular intervals. [1913 Webster] 3. An apparatus for diffusing a solution, as brine or vinegar, over a large surface, for exposure to the air. [1913 Webster]