The Collaborative International Dictionary of English v.0.48:

Copyist \Cop"y*ist\, n.
   A copier; a transcriber; an imitator; a plagiarist.
   [1913 Webster]

WordNet (r) 3.0 (2006):

copyist
    n 1: someone employed to make written copies of documents and
         manuscripts [syn: copyist, scribe, scrivener]