To make colorless or remove color from; in optics, to correct chromatic aberration in a lens; British spelling variant.
From 'achromat-' (colorless) + '-ise' (British verb suffix). Variant of 'achromatize,' standardized in British English during the 19th century.
British and American scientists both achromatise/achromatize lenses the same way, but they spell it differently—one of thousands of British-American English splits that confuse international students!
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