a lens, consisting of three or more elements of different types of glass, that is designed to bring light of three colours to the same focal point, thus reducing its chromatic aberration Compare achromat
corrected for spherical aberration at two wavelengths or colors and for at three wavelengths. adjective (of a lens) almost free from spherical and chromatic aberration
- Apochromatic objective
apochromatic objective apochromatic objective ap·o·chro·mat·ic objective (āp’ə-krō-māt’ĭk) n. An objective in which chromatic aberration is corrected for three colors and spherical aberration is corrected for two.
to shorten by . Historical Examples The lengthened form ăthov, or its apocopated thov, is generally found at the beginning of an assertion. A Handbook of the Cornish Language Henry Jenner verb (transitive) to omit the final sound or sounds of (a word)
to shorten by . verb (transitive) to omit the final sound or sounds of (a word)