Apochromatic Ap`o*chro*mat"ic, a. [Pref. apo- + chromatic.] (Optics) Free from chromatic and spherical aberration; -- said esp. of a lens in which rays of three or more colors are brought to the same focus, the degree of achromatism thus obtained being more complete than where two rays only are thus focused, as in the ordinary achromatic objective. -- {Ap`o*chro"ma*tism}, n. [Webster 1913 Suppl.]

The Collaborative International Dictionary of English. 2000.

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  • apochromatism — apochroˈmatism noun • • • Main Entry: ↑apochromatic …   Useful english dictionary

  • apochromatic — apochromatism /ap euh kroh meuh tiz euhm/, n. /ap euh kroh mat ik, oh kreuh /, adj. Optics. corrected for spherical aberration at two wavelengths or colors and for chromatic aberration at three wavelengths. [1885 90; APO + CHROMATIC] * * * …   Universalium

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