Achroite
the colorless or white variety of tourmaline, often used as a gem.
Historical Examples
Red tourmaline is, however, sometimes called “rubellite,” and white tourmaline has been called “achroite.”
A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public Frank Bertram Wade
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achromacyte achromacyte a·chro·ma·cyte (ā-krō’mə-sīt’, ə-krō’-) n. Variant of achromocyte.
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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 […]