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Concavity   Listen

(pl. concavities)
A shape that curves or bends inward.  Synonyms: concave shape, incurvation, incurvature.
The property possessed by a concave shape.  Synonym: concaveness.

WordNet 3.0 © 2010 Princeton University

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"Concavity" Quotes from Famous Books

... of fire, which must be held with this opinion here delivered; for if wee suppose a world in the Moone, then it will follow, that the spheare of fire, either is not there where 'tis usually placed in the concavity of his Orbe, or else that there is no such thing at all, which is most probable, since there are not any such solid Orbs, that by their swift motion might heare and enkindle the adjoyning aire, which is imagined to be the reason of that element. Concerning this see Cardan, Iohannes ...
— The Discovery of a World in the Moone • John Wilkins

... length, and has two unequal heads; its width across both of these is 4.0 mm. The length is appropriate to fit between the lateral face of the otic capsule and the dorsal edge of the quadrate; the wider head rests on a posterodorsal concavity on the otic capsule, and the smaller fits a lower, more anterior pit. Laterally the stapes carries a short, broad process that probably made contact with a dorsally placed tympanic membrane. Thus the bone was a hyomandibular in the sense that it articulated with the quadrate, but it may also have ...
— A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas • Theodore H. Eaton

... a beautiful woman. She had a slim perfect figure; quite simply she carried her head so high and her shoulders so square that her back seemed to be hollowed out, and no tightness on the part of a bodice could hide this charming concavity. Her face was handsome with its large regular features; one noticed the abundant black hair under the hat, the thick eyebrows, the brown and opaque skin, the teeth impeccably white, and the firm, unyielding ...
— Leonora • Arnold Bennett

... right (He is speaking of two kinds of mirrors, first the plane, secondly the concave; and the latter is supposed to be placed, first horizontally, and then vertically.). Or if the mirror be turned vertically, then the concavity makes the countenance appear to be all upside down, and the lower rays are driven upwards ...
— Timaeus • Plato

... sketch (fig. 1) represents a man sleeping in a natural attitude. It will be observed that he fits into a concavity of about 6 inches in greatest depth. (The scale on which he is drawn is 6 feet long and ...
— The Art of Travel - Shifts and Contrivances Available in Wild Countries • Francis Galton

... microscopically examined, various devices are employed in the construction of reflecting telescopes to avoid the loss of light which would result—a loss which would be important even with the largest mirrors yet constructed. Thus, in Gregory's Telescope, a small mirror, having its concavity towards the great one, is placed in the axis of the tube and forms an image which is viewed through an aperture in the middle of the great mirror. A similar plan is adopted in Cassegrain's Telescope, a small convex mirror ...
— Half-hours with the Telescope - Being a Popular Guide to the Use of the Telescope as a - Means of Amusement and Instruction. • Richard A. Proctor

... excavation, pit, perforation, rent, fissure, opening, aperture, delve, cache, concavity, mortise, puncture, orifice, eyelet, crevice, loophole, interstice, gap, spiracle, vent, bung, pothole, manhole, scuttle, scupper, muset, muse; cave, holt, den, lair, retreat, cover, hovel, burrow. Antonyms: imperforation, closure. Associated words: auger, drill, gimlet, bodkin, ...
— Putnam's Word Book • Louis A. Flemming

... respective cages, out of doors, which is equally salutary for themselves and agreeable to their visitors. I was much struck by the perpetual motion of a huge, restless, black bear, who has left the marks of his footsteps by a concavity in the floor:—as well as by the panting, and apparently painful, inaction of an equally huge white or gray bear—who, nurtured upon beds of Greenland ice, seemed to be dying beneath the oppressive heat of a Parisian ...
— A Bibliographical, Antiquarian and Picturesque Tour in France and Germany, Volume Two • Thomas Frognall Dibdin

... such circumstances as these that, during the forenoon of the tenth day of the calm, Gurney, upon examining the barometer, reported a concavity in the surface of the mercury, which, as we all knew, was the first indication of a tendency to fall; and a falling barometer of course meant a change of weather, which, in its turn, meant wind, from what quarter we scarcely cared, so long as it came with strength enough ...
— Overdue - The Story of a Missing Ship • Harry Collingwood

... altitude of the sun, at the same solstice, and on the very same day, at Alexandria. This he effected by a very simple contrivance: he employed a concave hemisphere, with a vertical style, equal to the radius of concavity; and by means of this he ascertained that the arch, intercepted between the bottom of the style and the extreme point of its shadow, was 7 deg. 12'. This, of course, indicated the distance of the sun from the zenith of Alexandria. But 7 deg. 12' is equal to the fiftieth part ...
— Robert Kerr's General History and Collection of Voyages and Travels, Volume 18 • William Stevenson

... form of hanging-drop slide is made in which a circular or oval concavity or "cell" is ground out of the centre of a 3 by 1 slip. These are more expensive, less convenient to work with, and are more easily contaminated by drops of material under examination, ...
— The Elements of Bacteriological Technique • John William Henry Eyre

... occasionally reddish; and sometimes oozing of blood is noticed. A most common picture in tuberculosis is a broadening of the carina, which may be so marked as to obliterate the carina and to bulge inward, producing deformed lumina in both bronchi. Sometimes the lumina are crescentic, the concavity of the crescent being internal, that is, toward the median line. Absence of the normal anterior and downward movement of the carina on deep inspiration is almost pathognomonic of a mass at the bifurcation, and such a mass is usually tuberculous, though ...
— Bronchoscopy and Esophagoscopy - A Manual of Peroral Endoscopy and Laryngeal Surgery • Chevalier Jackson

... the Silla de Caraccas over the Caribbean Sea. It gives you the impression of standing on the edge of the earth, and looking off into space. From the mast-head, the ocean appears either flat or slightly concave, and aeronauts declare that this apparent concavity becomes more marked, the higher they ascend. It is only at those rare periods when the air is so miraculously clear as to produce the effect of no air—rendering impossible the slightest optical illusion—that ...
— The Lands of the Saracen - Pictures of Palestine, Asia Minor, Sicily, and Spain • Bayard Taylor

... about 1/4 inch in diameter, often partially sunk, in a concavity of the rachis; the perfect spikelets are 1/5 to 1/4 inch long and ...
— A Handbook of Some South Indian Grasses • Rai Bahadur K. Ranga Achariyar

... began to loom up, like deformed battleships and flat-tops in a smoke screen, their prows being the juncture of the natural curve of the off-blast side with the massive concavity of ...
— The Night of the Long Knives • Fritz Reuter Leiber

... lines, I hoped to illustrate this important question by making experiments on induction with metallic mirrors (used only as conducting vessels) exposed towards a very clear sky at night time, and of such concavity that nothing but the firmament could be visible from the lowest part of the concave n, fig. 143. Such mirrors, when electrified, as by connexion with a Leyden jar, and examined by a carrier ball, readily gave electricity ...
— Experimental Researches in Electricity, Volume 1 • Michael Faraday

... those of standards for example, no concavity is seen, at any time: but it is otherwise with many barometers, ...
— Barometer and Weather Guide • Robert Fitzroy

... imperfectly prepared surface of two pieces of malleable iron about to be welded. The result of their concavity of form is that the scoriae are almost certain to be shut up in the hollow part,—as the pieces will unite first at the edges and thus include the scoriae, which no amount of subsequent hammering will ever dislodge. ...
— James Nasmyth's Autobiography • James Nasmyth

... planes parallel with its axis, and perfectly vertical. The keel (properly so called) is formed by the joining of the two vertical planes. The surface thus formed is a parabola whose apex is in front, the maximum ordinate behind, and the concavity directed toward the bottom of the water. The stern is a vertical plane intersecting at right angles the two lateral faces and the parabolic curve, which thus terminates in a sharp edge. The prow of the boat ...
— Scientific American Supplement, No. 385, May 19, 1883 • Various

... becomes more and more club-like, and eventually cup-like. These changes of shape are expressive of great changes of structure, as may be seen in the last of the series (v), where the shallow cup is seen in partial section. The electric plate lines the concavity of the cup, and is richly supplied with nerves (only a few of which are represented in the last drawing); the thick walls of the cup are composed of muscular fibres, the striation of which ...
— Darwin, and After Darwin (Vol. 1 and 3, of 3) • George John Romanes

Words linked to "Concavity" :   fossa, configuration, concave, trough, depression, recess, indenture, dome, cup, incurvation, imprint, bowl, niche, contour, corner, pocket, scoop, hollowness, shape, impression, solid, form, pit, indentation, conformation, recession

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