perfecter

from WordNet (r) 3.0 (2006)

perfecter
    n 1: a skilled worker who perfects something; "although not the
         inventor he must be recognized as the perfecter of this
         technique"

from The Collaborative International Dictionary of English v.0.48

Perfecter \Per"fect*er\, n.
   One who, or that which, makes perfect. "The . . . perfecter
   of our faith." --Barrow.
   [1913 Webster]

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