Achromasia



achromasia

achromasia ach·ro·ma·si·a (āk’rō-mā’zē-ə, -zhə)
n.

Pallor associated with the hippocratic facies of extremely severe and chronic illness.

See achromia.

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  • Achromat

    . noun Also called achromatic lens. a lens designed to bring light of two chosen wavelengths to the same focal point, thus reducing chromatic aberration Compare apochromat a person who has no colour vision at all and can distinguish only black, white, and grey. The condition is very rare

  • Achromate

    a person unable to perceive color.



  • Achromatic

    Optics. free from color. able to emit, transmit, or receive light without separating it into colors. Biology. (of a cell structure) difficult to stain. Music. without accidentals or changes in key. Historical Examples achromatic lenses are used in all high-grade optical instruments such as telescopes and microscopes. Physics Willis Eugene Tower If not, the substitution […]

  • Achromatic colour

    noun (physics) colour, such as white, black, and grey, that is devoid of hue See colour (sense 2)



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