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ground

 [grownd]
1. a path of conduction from an electrical circuit to the earth.
2. to connect an electrical circuit or electrical equipment to the earth.
3. zero electrical potential.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

ground

1. Basic substance or foundation.
2. Reduced to a powder; pulverized.
3. In electronics, the negative or earth pole that has zero electrical potential.
Medical Dictionary, © 2009 Farlex and Partners

figure

A part or pattern in the visual field which has the perceptual attribute of completeness and is perceived as distinct from the rest of the field which forms the ground. Example: a printed word against a background page.
ambiguous figure An image or drawing arranged in such a way that its perception oscillates or flips involuntarily between, usually, two interpretations even though the retinal image remains constant, thus indicating that higher cortical processing are involved. Syn. reversible figure. See Blivet figure; Kanizsa figure; illusion; Necker cube; Rubin's vase; Schroeder's staircase.
Blivet figure An 'impossible' figure in which three apparently solid tubes are attached at one end of a rectangular base which projects only two bars (Fig. F4). See Necker cube; Schroeder's staircase; Rubin's vase.
fortification figure See scintillating scotoma.
Kanizsa figure An ambiguous figure in which the illusory contour of a square (or triangle) appears in the middle of four (or three) truncated solid squares (or circles). It is an illustration of the perceptual ability to make sense of an incomplete figure by creating a 'whole' image from the separate elements (Gestalt organization). Some people cannot perceive the contour. Syn. Kanizsa square (Fig. F5).reversible f. See ambiguous figure.
Fig. F4 Blivet figureenlarge picture
Fig. F4 Blivet figure
Fig. F5 Kanisza figureenlarge picture
Fig. F5 Kanisza figure
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
Furthermore, both Hispanic and Asian children also experience worse schools than whites, but neither of those groups is losing ground. All in all, the issue is murky--perhaps because the measures of school quality in the data are inadequate.
In that article, and in a longer piece for the spring 1994 issue of The Public Interest, Murray's villains were no longer the kindly but deadly liberal social engineers of Losing Ground. Murray's new welfare villains were the welfare mothers themselves.
During the past two decades, minimum wage earners have not only been losing ground in terms of their absolute and relative earnings, but their purchasing power has eroded because of inflation.
Murray's epiphany led to Losing Ground, in which he argued that the source of poverty among black Americans in particular, the so-called urban underclass, is the attempt to alleviate poverty through social provision.
Zuhur finds that the image of the secular, elite woman propagated in recent history by the dominant ideology is losing ground to that advanced by the Islamists.
Rail markets are losing ground to truck competition and new articulated railcars will use fewer castings per car;
In its traditional profit line--mainframe computers--IBM is losing ground to rivals like Amdahl and Fujitsu.
currency gaining versus the Yen but losing ground against rebounding Dollar Bloc currencies, with a lift-from-lows and rebound in S&P 500 futures facilitating some squaring out of risk-off positioning.
Plunging banking issues also dampened investor sentiment, with Japan's four major banking groups all losing ground. Mizuho Financial Group was the most heavily traded issue by value, down 25,000 yen to 210,000 yen.
There are a number of reasons why JFK is losing ground. For example, it does not have enough cargo facilities either at the airport itself or in the immediate area, and many of the facilities it does have are in desperate need of repair.
Losing Ground suggested cutting off welfare as a remedy to the anti-social incentives placed before the poor.
Fletcher told a Senate subcommittee this week that "we are getting the space program back on track") or losing ground.