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American Heritage Dictionary - Cite This Source - Share This

ach·ro·mat·ic       (āk'rə-māt'ĭk)  Pronunciation Key  adj.   Designating color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black. Refracting light without spectral color separation. Biology Difficult to stain with standard dyes. Used in reference to cells or tissues. Music Having only the diatonic tones of the scale. [From Greek akhrōmatos : a-, without; see a-1 + khrōma, khrōmat-, color.] ach'ro·mat'i·cal·ly adv., a·chro'ma·tism (ā-krō'mə-tĭz'əm), a·chro'ma·tic'i·ty (-tĭs'ĭ-tē) n.

WordNet - Cite This Source - Share This

achromatic

adjective

having no hue; "neutral colors like black or white" [ant: chromatic]

The American Heritage Science Dictionary - Cite This Source - Share This

achromatic       (āk'rə-māt'ĭk)  Pronunciation Key  Designating color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black.

American Heritage Stedman's Medical Dictionary - Cite This Source - Share This

achromatic ach·ro·mat·ic (āk'rə-māt'ĭk)
adj.

1. Of or relating to color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black.
2. Refracting light without spectral color separation.
3. Of or relating to cells or tissues difficult to stain with standard dyes.

Webster's Revised Unabridged Dictionary - Cite This Source - Share This

Achromatic

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.