The Collaborative International Dictionary of English v.0.48:

Dialytic \Di`a*lyt"ic\, a. [Gr. ?, fr. ?. See Dialysis.]
   Having the quality of unloosing or separating. --Clarke.
   [1913 Webster]

   Dialytic telescope, an achromatic telescope in which the
      colored dispersion produced by a single object lens of
      crown glass is corrected by a smaller concave lens, or
      combination of lenses, of high dispersive power, placed at
      a distance in the narrower part of the converging cone of
      rays, usually near the middle of the tube.
      [1913 Webster]