### chromatic

GRE

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chromatic 半音阶的

1590s (of music), "progressing by half-tones;" 1831 as "pertaining to color," from Latin chromaticus, from Greek khromatikos "relating to color, suited for color," from khroma (genitive khromatos) "color, complexion, character," but chiefly used metaphorically of embellishments in music, originally "skin, surface" (see chroma).
1. The removal of the chromatic aberration is then of primary importance.

2. The resultant defect is known as chromatic aberration.

3. One of the principal advantages of the reflecting glass is its complete freedom from chromatic aberration.

4. The absolute values of the coefficients of any chromatic polynomial form a unimodal sequence.

5. It's an easy matter to observe chromatic aberrations , with a thick, simple converging lens.