[mod. f. Gr. ἀχρώματ-ος uncolored + -ISM.] The state or quality of being achromatic, or of transmitting only white light.
1797. Encycl. Brit., s.v. Telescope, Mr. Dollond was anxious to combine this achromatism of the eye-pieces with the advantages which he had found in the eye-pieces with five glasses.
1859. Parkinson, Optics, ix. 167. The conditions of achromatism depend only on the focal lengths of the component lenses.
1881. G. R. Piggott, in Nature, No. 622. 515. Achromatism is seldom attained without generating a whitish haze, the inevitable accompaniment of residuary spherical aberration.
