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
This might not necessarily be a real appearance for it is conceivable that such traces of colour might be due to the telescopes employed not having been truly achromatic, that is, not sufficiently corrected for colour; but making every allowance for this possible source of mistake there yet remains proof that the colour which has often been seen has been real.
In a refracting telescope we have to employ what is known as the achromatic combination, consisting of one lens of flint glass and one of crown glass, adjusted to suit each other with extreme care.
Of course the presence of either of these defects is certainly and correctly indicated by the appearance of one or the other of the colors, under certain circumstances; but the simple visibility of prismatic color is by no means a reliable indication of over or under correction of color, and, indeed, to the honor of our opticians, it may be stated that very few objectives are made that cannot justly be called achromatic in the general sense of the term.
Although with the increase in power it is correspondingly difficult to combine all these corrections in one objective, they are brought to a high pitch of excellence in the present-day "achromatic" objectives, and so remove the necessity for the use of the higher priced and less durable apochromatic lenses.
Her achromatic breasts sway freely inside the full halter and I see her hips dance, suggesting that I do something.
Also, belated greetings to achromatic, and Hippo Birdie Dates to Marilee!
While designing the achromatic objective lens for a telescope, he saw the spectrum of sunlight as it passed through a thin slit and the dark emission lines.
His achromatic objective lens is still used in modern telescopes.
A nation's institutional memory is invariably simplistic and achromatic, with good guys in white hats and bad guys in black.
Dictionary. com Unabridged (v 1.1) - Cite This Source - Share This a-6 var. of an - 1 before a consonant, meaning “not,” “without”: amoral; atonal; achromatic.