The Collaborative International Dictionary of English v.0.48:

Lanch \Lanch\ (l[.a]nch), v. t. [imp. & p. p. Lanched
   (l[.a]ncht); p. pr. & vb. n. Lanching. See Launch,
   Lance.]
   To throw, as a lance; to let fly; to launch.
   [1913 Webster]

         See Whose arm can lanch the surer bolt.  --Dryden &
                                                  Lee.
   [1913 Webster]