Adjacent Words

Achromatic definitions

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Webster's 1828 Dictionary

ACHROMAT'IC, a. [Gr. priv. and color.]
Destitute of color. achromatic telescopes are formed of a combination of lenses, which separate the variously color rays of light to equal angles of divergence, at different angles of refraction of the mean ray. In this case, the rays being made to refract towards contrary parts, the whole ray is caused to deviate from its course, without being separated into colors, and the optical aberration arising from the various colors of light, is prevented. This telescope is an invention of Dolland.

WordNet (r) 3.0 (2005)

adj
1: having no hue; "neutral colors like black or white" [syn: achromatic, neutral] [ant: chromatic]

Merriam Webster's

adjective Date: 1766 1. refracting light without dispersing it into its constituent colors ; giving images practically free from extraneous colors <an achromatic telescope> 2. not readily colored by the usual staining agents 3. possessing no hue ; being or involving black, gray, or white ; neutral <achromatic visual sensations> 4. being without accidentals or modulation ; diatonic • achromatically adverb • achromatism noun • achromatize transitive verb

Oxford Reference Dictionary

adj. Optics 1 that transmitts light without separating it into constituent colours (achromatic lens). 2 without colour (achromatic fringe). Derivatives: achromatically adv. achromaticity n. achromatism n. Etymology: F achromatique f. Gk akhromatos (as A-(1), CHROMATIC)

Webster's 1913 Dictionary

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.

Soule's Dictionary of English Synonyms

a. Colorless, uncolored, untinged, hueless, free from color, perfectly transparent.