• WordNet 3.6
    • n opacity the quality of being opaque to a degree; the degree to which something reduces the passage of light
    • n opacity incomprehensibility resulting from obscurity of meaning
    • n opacity the phenomenon of not permitting the passage of electromagnetic radiation
    • ***
Webster's Revised Unabridged Dictionary
    • Opacity Obscurity; want of clearness.
    • Opacity The state of being opaque; the quality of a body which renders it impervious to the rays of light; want of transparency; opaqueness.
    • ***
Century Dictionary and Cyclopedia
    • n opacity The state of being opaque; opaqueness; the quality of a body which renders it impervious to the rays of light; want of transparency.
    • n opacity That which is opaque; an opaque body or object; an opaque part or spot.
    • n opacity Darkness; obscurity.
    • ***
Chambers's Twentieth Century Dictionary
    • n Opacity ō-pas′i-ti opaqueness: obscurity.
    • ***


Webster's Revised Unabridged Dictionary
L. opacitas,: cf. F. opacité


In literature:

Transparency, opacity and colour were explained by Newton on the following principles.
"The World's Greatest Books, Vol IX." by Edited by Arthur Mee and J.A. Hammerton
Mrs. Eddy's success in literature arose from the extreme muddiness of her thinking and her opacity in expression.
"Little Journeys To The Homes Of Great Teachers" by Elbert Hubbard
Good water should be beautifully transparent; a slight opacity indicates extraneous matter.
"A Treatise on Adulterations of Food, and Culinary Poisons" by Fredrick Accum
Is this not a contributing factor to the futility and opacity of our political thinking?
"A Preface to Politics" by Walter Lippmann
It was not alone from the volcano that they derived their strange opacity and weight.
"The Secret of the Island" by W.H.G. Kingston (translation from Jules Verne)
The brooding opacity which wrapped the scene made the location of the sound uncertain; but it was up somewhere among the hills.
"Joan of Arc of the North Woods" by Holman Day
The boat silently approached along the green water; its opacity prevented the animal seeing the enemy.
"The English at the North Pole" by Jules Verne
Bright potatoes, flower starred, And the opacous colour of beans.
"The Defeat of Youth and Other Peoms" by Aldous Huxley
What, then, is the physical meaning of opacity and transparency as regards light and radiant heat?
"Fragments of science, V. 1-2" by John Tyndall
Layroh adjusted the nozzles until the black beam was a solid shaft of opacity seven feet in height and nearly five in width.
"The Cavern of the Shining Ones" by Hal K. Wells

In poetry:

O triple goddess! Contemplate my plight!
Opacity, my fate! Change, my delight!
The yellow tom-cat, sunk in shifting fur,
Changes and dreams, a phosphorescent blur.
"Sonnet To The Moon" by Yvor Winters

In news:

According to the National Eye Institute, more than half of Americans over the age of 80 suffer from cataracts , an ocular disorder characterized by opacity in the eye's lens.
Remy-Jardin M, Remy J, Giraud F, et al: Computed tomography assessment of ground-glass opacity: Semiology and significance.
Collins J, Stern EJ: Patterns of ground glass opacity on CT scanning of the chest.
It was unlike anything I had seen before: It had the opacity of a. Click on the product you are looking for.
Lamination whites need to have good opacity, bond strength, and excellent print characteristics for structural and aesthetic purposes.
Could Opacity Be the New Transparency.
New Test Method for Determining the Opacity of Fugitive Emissions, in the Outdoor Ambient Atmosphere, Using Digital Imager.
1.1 This test method describes the procedures to determine the opacity of fugitive emissions plumes.
Create an Opacity Gradient with Final Cut Pro.
Lamitech, Inc.'s Opacity II Papers for Printing your POP Materials.
Here, I've lowered the Opacity of the High Pass layer a bit to soften up the skin a little more, because there's plenty of texture visible in the image.
In-line opacity & turbidity tester.
TQC's new Automatic Film Applicator is designed to ensure uniform delivery of paint and coating film thickness, opacity, hiding power, gloss, color and other application parameters.
The challenge in working for government transparency is that you are always working against its opposite: opacity.
A nodular opacity was detected anteriorly on the lateral view.

In science:

All calculations included the bound-free and free-free opacities of the H− ion and incorporated a full treatment for the blanketing effects of HI lines and the Lyman −α, −β and −γ satellite opacities as computed by N.
New Praesepe white dwarfs and the initial mass-final mass relation
The opacity-sampled synthetic spectra need to be smoothed in order to compare them to data.
The Effective Temperatures and Physical Properties of Magellanic Cloud Red Supergiants: The Effects of Metallicity
However, they can be understood after computing the opacity spectra for physical conditions we will find in the disk.
The magnetic Bp star 36 Lyncis, II. A spectroscopic analysis of its co-rotating disk
The spatial resolution in the center is good, but can be improved on the outside exterior to ∼200 km; and 9) The opacities employed are sophisticated(47), but the neutrino-matter correlation effects at higher densities need a second look.
Multi-Dimensional Explorations in Supernova Theory
Hence, when using their equivalent widths to derive S abundances, the opacity contribution from the Pζ line should be taken into account.
Sulphur and zinc abundances in Galactic halo stars revisited