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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 ?
Oklahoma, broke ground on a 60,000 sq ft greenfield plant.
Cariste said that The Morris Companies acquired title from Chevron late last year and broke ground this spring on the first "spec' building.
Pantheon Properties, an entity of New York-based The Pantheon Companies and one of the leading developers of industrial, office, mixed-use and multi-family real estate projects, broke ground this week in Bayonne, New Jersey, on a more than-33,000 s/f expansion of Pantheon's existing warehouse facility on New Hook Road.
Hovnanian and Equity Residential, broke ground at ceremonies recently for two 500-foot, Manhattan-style residential skyscrapers to meet the growing demand for housing in the area.
Brooklyn College broke ground for a new $115 million West Quad designed by celebrated and award-winning architect, Rafael Vinoly.
Executives from Edison Properties, LLC broke ground at 188 Ludlow St.
Jersey City public officials and executives from the Athena Group broke ground last week on the newest condominium tower to rise on Jersey City's Gold Coast waterfront--the $110 million luxury project at 389 Washington Boulevard entitled "A Jersey City."