The Collaborative International Dictionary of English v.0.48:

Targum \Tar"gum\, n.; pl. Targums. Heb. Targumim. [Chald.
   targ[=u]m interpretation, fr. targ[=e]m to interpret. Cf.
   Truchman, and Dragoman.]
   A translation or paraphrase of some portion of the Old
   Testament Scriptures in the Chaldee or Aramaic language or
   dialect.
   [1913 Webster]