Definition of apochromatic
English to English adjective - 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.
source: Webster 1913 adjective satellite - corrected for both chromatic and spherical aberration
An apochromatic lens.
source: WordNet 3.0
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