achromatic

• POS: Adjective
• HYPHEN: ach=ro=mat=ic

CIDE DICTIONARY

achromatic, a. [Gr. colorless; 'a priv. + , , color: cf. F. achromatique.].

•  Free from color; transmitting light without decomposing it into its primary colors.  [1913 Webster]
•  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.

OXFORD DICTIONARY

achromatic, adj. Optics 1 that transmitts light without separating it into constituent colours (achromatic lens).
2 without colour (achromatic fringe).

Derivative

achromatically adv. achromaticity n. achromatism n.

Etymology

F achromatique f. Gk akhromatos (as A-(1), CHROMATIC)

ROGET THESAURUS

achromatic

Achromatism

N achromatism, decoloration, discoloration, pallor, pallidness, pallidity, paleness, etiolation, neutral tint, monochrome, black and white, uncolored &c (color), colorless, achromatic, aplanatic, etiolate, etiolated, hueless, pale, pallid, palefaced, tallow-faced, faint, dull, cold, muddy, leaden, dun, wan, sallow, dead, dingy, ashy, ashen, ghastly, cadaverous, glassy, lackluster, discolored, light-colored, fair, blond, white, pale as death, pale as ashes, pale as a witch, pale as a ghost, pale as a corpse, white as a corpse.