apochromacy
|a-po-chro-ma-cy|
🇺🇸
/ˌeɪpəˈkroʊməsi/
🇬🇧
/ˌeɪpəˈkrəʊməsi/
absence of color fringing
Etymology
'apochromacy' originates from Greek via New Latin/Modern scientific English, specifically from the elements 'apo-' and 'chrōma', where 'apo-' meant 'away from' and 'chrōma' meant 'color'.
'apochromacy' developed from the adjective 'apochromatic' (used in 19th-century optical science) and the related noun 'apochromatism'; the English noun 'apochromacy' later emerged to denote the property of being apochromatic.
Initially it meant 'the state or property of being apochromatic (corrected for color)', and over time it has remained a specialized technical term with the same optical meaning.
Meanings by Part of Speech
Noun 1
the property of an optical system (such as a lens) being apochromatic — i.e., corrected for chromatic aberration across multiple wavelengths (typically three), producing images with minimal color fringing.
The telescope's apochromacy reduces color fringing around bright stars and yields sharper images.
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Noun 2
the degree or quality of correction for color errors in optical instruments; used to compare lenses (e.g., an objective with superior apochromacy).
Manufacturers advertise the apochromacy of high-end camera lenses to highlight their color correction performance.
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Last updated: 2025/12/09 21:59