from the GNU version of the Collaborative International Dictionary of English
- adj. 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.
- n. See under Dialytic.
Sorry, no etymologies found.