a. [ Gr. 'achrw`matos colorless; 'a priv. + chrw^ma, chrw`matos, color: cf. F. achromatique. ] 1. (Opt.) Free from color; transmitting light without decomposing it into its primary colors. [ 1913 Webster ]

2. (Biol.) Uncolored; not absorbing color from a fluid; -- said of tissue. [ 1913 Webster ]

Achromatic lens (Opt.), a lens composed usually of two separate lenses, a convex and concave, of substances having different refractive and dispersive powers, as crown and flint glass, with the curvatures so adjusted that the chromatic aberration produced by the one is corrected by other, and light emerges from the compound lens undecomposed. --
Achromatic prism. See Prism. --
Achromatic telescope, or
microscope, one in which the chromatic aberration is corrected, usually by means of a compound or achromatic object glass, and which gives images free from extraneous color. [ 1913 Webster ]

adv. In an achromatic manner. [ 1913 Webster ]

n. Achromatism. [ 1913 Webster ]

n. (Biol.) Tissue which is not stained by fluid dyes. W. Flemming. [ 1913 Webster ]

adj. 1. not readily colored by stains; -- of substance of a cell nucleus chromatinic [ WordNet 1.5 ]

v. 1. remove color from.
Syn. -- achromatize, make achromatic [ WordNet 1.5 ]

n. [ Cf. F. achromatisme. ] The state or quality of being achromatic; as, the achromatism of a lens; achromaticity. Nichol. [ 1913 Webster ]

n. [ Cf. F. achromatisation. ] The act or process of achromatizing. [ 1913 Webster ]

v. t. [ imp. & p. p. Achromatized p. pr. & vb. n. Achromatizing ] [ Gr. 'a priv. + &unr_; color. ] To deprive of color; to make achromatic. [ Also spelled achromatise. ] [ 1913 Webster ]

n. [ Gr. 'a priv. + &unr_; color + &unr_; sight. ] Color blindness; inability to distinguish colors; Daltonism. [ 1913 Webster ]