apochromatism
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Apochromatism — 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… … The Collaborative International Dictionary of English
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
