| achromacyte | A hypochromic, crescent-shaped erythrocyte, probably resulting from artifactual rupture of a red cell with loss of haemoglobin. Synonym: achromacyte, achromatocyte, ghost corpuscle, phantom corpuscle, Ponfick's shadow, shadow corpuscle, shadow, Traube's corpuscle. Origin: G. A-priv. + chroma, colour, + kytos, hollow (cell) (05 Mar 2000) |
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| achromasia | 1. Pallor associated with hippocratic facies, emaciation, and weakness, often heralding a moribund state. Synonym: cachectic pallor, achromia. Origin: G. Achromos, colourless (05 Mar 2000) |
| achromat | A person exhibiting achromatopsia. Origin: G. A-priv. + chroma, colour (05 Mar 2000) |
| achromatic | <microscopy> Literally, colour-free. A lens or prism is said to be achromatic when corrected for two colours. The remaining colour seen in an image formed by such a lens is said to be secondary chromatic aberration. A truly achromatic lens would transmit light without decomposing it spectrally and there would be no colour fringing in the image. A doublet, composed of a positive and negative lens element, can be made achromatic for two colours which much improves the performance for most of the others. (05 Aug 1998) |
| achromatic aplanatic condenser | <microscopy> A well-corrected microscope condenser lens, corrected for chromatic and spherical aberrations and satisfying the sine condition. (05 Aug 1998) |
| achromatic apparatus | The nonstaining asters and spindle fibres in a dividing cell. (05 Mar 2000) |
| achromatic lens | A compound lens made of two or more lens's having different indices of refraction, so correlated as to minimise chromatic aberration. (05 Mar 2000) |
| achromatic objective | <microscopy> An objective that is corrected chromatic for two colours, and spherically for one, usually in the yellow-green part of the spectrum. (05 Aug 1998) |
| achromatic threshold | Threshold of visual sensation, the minimal light intensity evoking a visual sensation. Synonym: achromatic threshold, minimum light threshold. (05 Mar 2000) |
| achromatic vision | A severe congenital deficiency in colour perception, often associated with nystagmus and reduced visual acuity. Synonym: achromatic vision, monochromasia, monochromasy, monochromatism. Origin: G. A-priv. + chroma, colour, + opsis, vision (05 Mar 2000) |
| achromatically | In an achromatic manner. Source: Websters Dictionary (01 Mar 1998) |
| achromaticity | The state or quality of being achromatic; as, the achromatism of a lens; achromaticity. Origin: Cf. F. Achromatisme. Source: Websters Dictionary (01 Mar 1998) |
| achromatin | <biology> Tissue which is not stained by fluid dyes. Source: Websters Dictionary (01 Mar 1998) |
| achromatinic | Relating to or containing achromatin. (05 Mar 2000) |
| achromatism | The state or quality of being achromatic; as, the achromatism of a lens; achromaticity. Origin: Cf. F. Achromatisme. Source: Websters Dictionary (01 Mar 1998) |
| achromatinic |
(of substance of a cell nucleus) not readily colored by stains
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| achromasia |
lividness: unnatural lack of color in the skin (as from bruising or sickness or emotional distress)
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| achromatic |
having no hue
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| achromatic lens |
a compound lens system that forms an image free from chromatic aberration
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| achromatic vision |
vision using the rods
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| achroma | unnatural lack of color in the skin (as from bruising or sickness or emotional distress) |
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| achroma | having no hue |
| achroma | being of the achromatic color of maximum darkness |
| achroma | being of the achromatic color of maximum lightness |
| achroma | a color lacking hue |
| achroma | a color lacking hue |
| achroma | a compound lens system that forms an image free from chromatic aberration |
| achroma | vision using the rods |
| achroma | the part of a cell nucleus that is relatively uncolored by stains or dyes |
| achroma | (of substance of a cell nucleus) not readily colored by stains |
| achroma | remove color from |
| achroma | the visual property of being without color |
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