from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Designating color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black.
- adj. Refracting light without spectral color separation.
- adj. Biology Difficult to stain with standard dyes. Used in reference to cells or tissues.
- adj. Music Having only the diatonic tones of the scale.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Free from color; transmitting light without color-related distortion.
- adj. Containing components such as achromatic lenses and prisms, designed to prevent color-related distortion.
- adj. Uncolored; not absorbing color from a fluid; -- said of tissue
- adj. Having only the diatonic notes of the scale; not modified by accidentals.
- adj. Being achromatic in subject
from the GNU version of the Collaborative International Dictionary of English
- adj. Free from color; transmitting light without decomposing it into its primary colors.
- adj. Uncolored; not absorbing color from a fluid; -- said of tissue.
from The Century Dictionary and Cyclopedia
- Destitute of color; free from coloration; transmitting light without decomposing it into its constituent colors: as, an achromatic lens or telescope.
- In biology: Colorless; hyaline.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. having no hue
From Greek akhrōmatos : a-, without; see a-1 + khrōma, khrōmat-, color.(American Heritage® Dictionary of the English Language, Fourth Edition)
Ancient Greek ἀχρωμάτιστος (akhrōmatistos, "uncolored"), from ἀ- (a-, "alpha privative") + χρῶμα (khrōma, "color"); compare French achromatique (Wiktionary)