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.
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.