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Pronunciation:  `akru'matik

WordNet Dictionary
  1. [adj]  having no hue
  2. [adj]  being of the achromatic color of maximum darkness; having little or no hue owing to absorption of almost all incident light; "black leather jackets"; "as black as coal"; "rich black soil"
  3. [adj]  being of the achromatic color of maximum lightness; having little or no hue owing to reflection of almost all incident light; "as white as fresh snow"; "a bride's white dress"

ACHROMATIC is a 10 letter word that starts with A.


 Synonyms: albescent, argent, ash-gray, ash-grey, ashy, black, blackish, blue-black, canescent, chalky, charcoal, charcoal-gray, charcoal-grey, coal-black, ebon, ebony, gray, grayish, grey, greyish, hueless, ink-black, inky, inky-black, iron-gray, iron-grey, jet, jet-black, lily-white, milk-white, neutral, off-white, oxford-gray, oxford-grey, pearly, pearly-white, pitchy, sable, silver, silverish, silvery, slate-gray, slatey, slaty, snow-white, snowy, sooty, stone-gray, whitish
 Antonyms: achromatic, chromatic, white
 See Also: colorless, colourless, dark, light, light-colored



Webster's 1913 Dictionary
\Ach`ro*mat"ic\, a. [Gr. ? colorless; 'a priv. + ?,
?, color: cf. F. achromatique.]
1. (Opt.) Free from color; transmitting light without
   decomposing it into its primary colors.

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

{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.