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Opacity   /oʊpˈæsəti/   Listen

The phenomenon of not permitting the passage of electromagnetic radiation.
Incomprehensibility resulting from obscurity of meaning.  Synonym: opaqueness.
The quality of being opaque to a degree; the degree to which something reduces the passage of light.  Synonym: opaqueness.

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"Opacity" Quotes from Famous Books

... towered like a giant's. His abundant red hair, waving thickly from his bulging forehead, redeemed by its single note of colour the rigidity of his features. His eyes—small, keen, deeply set beneath heavy brows—flashed from a dull opacity to an alert animation. But in the first and last view of his face it was the mouth that marked the man; the straight, thin lips would close or unclose at their own will, not at another's—the line of the mouth, like the line of the hard, square jaw, ...
— The Voice of the People • Ellen Glasgow

... sweeping, together with night, from the sea, practically the whole of the batey was laid out before Lee. The sun was still apparent in a rayless diffusion above a horizon obliterated in smoke, a stationary cloud-like opacity only thinning where the buildings began: the objects in the foreground were sharp; but, as the distance increased, they were blurred as though seen through a swimming of the vision. The great bulk of the sugar mill, at the left, like—on the flatness ...
— Cytherea • Joseph Hergesheimer

... infinite depths. The rose-glow in which we stood was cut off by the blackness as though it had substance; it shimmered out to meet it, and was checked as though by a blow; indeed, so strong was the suggestion of sinister, straining force within the rayless opacity that I shrank back, and Marakinoff with me. Not so O'Keefe. Olaf beside him, he strode to the wall and peered over. He ...
— The Moon Pool • A. Merritt

... cirrocumulus; mackerel sky, mare's tale, dirty sky; curl cloud; frost smoke; thunderhead. [Science of clouds] nephelognosy[obs3]; nephograph[obs3], nephology[obs3]. effervescence, fermentation; bubbling &c. v. nebula; cloudliness &c. (opacity) 426[obs3]; nebulosity &c. (dimness) 422. V. bubble, boil, foam, froth, mantle, sparkle, guggle[obs3], gurgle; effervesce, ferment, fizzle. Adj. bubbling &c. v.; frothy, nappy[obs3], effervescent, sparkling, ...
— Roget's Thesaurus

... declared that only a miracle could have wrought it. The next day he gave the following testimony: "I the undersigned, can certify on oath, that five years ago, I examined Mary Cote's eyes, and found that the small-pox had produced opacity of the cornea of both, or the disease called leucoma. I pronounced the case incurable, and refused in consequence to prescribe medical treatment. I certify that I re-examined the same little girl on the 4th of September, 1867, and that I cannot explain the ...
— The Life of the Venerable Mother Mary of the Incarnation • "A Religious of the Ursuline Community"

... from this, and other causes, it arises that when the naked light from fifty cells is looked at the blur of light upon the retina is sufficient to destroy the definition of the retinal image of the carbons. A long list of indictments might indeed be brought against the eye—its opacity, its want of symmetry, its lack of achromatism, its partial blindness. All these taken together caused Helmholt to say that, if any optician sent him an instrument so defective, he would be justified in sending it back with the severest censure. But the eye is not ...
— Six Lectures on Light - Delivered In The United States In 1872-1873 • John Tyndall

... the stack. While he was returning to the entrance, the wind rolled him over a few times, causing him to lose his bearings. It was blowing a hurricane, the temperature was -70 F., and the drift-snow was so thick as to be wall-like in opacity. He abandoned his load of coal, and, after searching about fruitlessly for some time in the darkness, he decided to wait for dawn. Hurley found him about twenty yards from ...
— The Home of the Blizzard • Douglas Mawson

... seems to lie in the temperament and in the transmuting and modifying medium. More or less of filtration does it all. Nature makes the poet, not by adding to, but by taking from; she takes all blur and opacity out of him; condenses, intensifies; lifts his nerves nearer the surface, sharpens his senses, and brings his whole organization to an edge. Sufficient filtration would convert charcoal into diamonds; and we shall ...
— Atlantic Monthly Volume 6, No. 37, November, 1860 • Various

... penetrates. The clouds perpetually formed at the top of such a current, will be perpetually thrust aside by the uncondensed gases from below them; and, growing while they are thrust aside, will collect in the spaces between the ascending currents, where there will result the greatest degree of opacity. Hence the mottled appearance—hence the "pores," or dark ...
— Essays: Scientific, Political, & Speculative, Vol. I • Herbert Spencer

... body of this rock is perfectly solid, and the salt, in many places, pure, colourless, and transparent, breaking with a sparry cubical structure. But the greatest part is tinged by the admixture of the marl, and that in various degrees, from the slightest tinge of red, to the most perfect opacity. Thus, the rock appears as if it had been a mass of fluid salt, in which had been floating a quantity of marly substance, not uniformly mixed, but every where separating and subsiding from the ...
— Theory of the Earth, Volume 1 (of 4) • James Hutton

... has extended the result to opaque bodies, and has shown that if light be passed through magnetized iron its plane is rotated. The film of iron must be exceedingly thin, because of its opacity, and hence, though the intrinsic rotating power of iron is undoubtedly very great, the observed rotation is exceedingly small and difficult to observe; and it is only by a very remarkable patience and care and ingenuity ...
— Scientific American Supplement No. 275 • Various

... of time varying from a few seconds to a quarter of an hour, according to the amount of albumen present, a delicate opalescent zone forms at the point of junction, and if mucin also is present, a more diffused haze higher up in the urine. Special attention should be given to the position of the opacity. In some concentrated urines a belt of urates will appear at the line of demarkation; but these dissolve on warming. Moreover, owing to the dilution necessary in the mode of applying Galippe's picric acid test, they are not so readily ...
— Scientific American Supplement, No. 611, September 17, 1887 • Various

... wound off from twenty-four spiders in about two hours. Mr. R. estimates its length at 18,000 feet; its colour is white, and its lustre is brilliant, and completely metallic, owing, probably, to its great opacity. No attempt has been made by him to combine two or more filaments into one by winding, nor, of course, to form it ...
— The Mirror of Literature, Amusement, and Instruction, Vol. 19, - Issue 553, June 23, 1832 • Various

... village school. He found the junior curate troubling the youthful mind with what their godfathers and godmothers did for them, and begging them to do their duty "in that state of life," etc. He listened, wondering at the pious opacity, and presently asked the children to sing. With inimitable melancholy they sang: "Oh, the Roast Beef ...
— The Judgment House • Gilbert Parker

... spite of all Billy's efforts the evening went wrong after that. Caroline was wrapped in a mantle of sorrowful meditation the opacity of which she was not willing to let Billy penetrate for a moment. After they had dined they took a taxi-cab up-town and danced for an hour on the smooth floor of one of the quieter hotels. Billy's dancing being of that light, sure, rhythmic quality that should have ...
— Outside Inn • Ethel M. Kelley

Words linked to "Opacity" :   quality, muddiness, clarity, cloudiness, blurriness, transparency, opaque, opaqueness, fogginess, optical opacity, fuzziness, physical phenomenon, incomprehensibility, radio-opacity, radiopacity, murkiness, indistinctness, softness

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