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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 ?
This book breaks new ground in basing its analysis of dramatic texts upon iconographical evidence derived from woodcuts in John Foxe's Book of Martyrs and works by German Lutheran artists including Durer, Cranach, and Ostendorfer.
From Calabar to Carter's Grove: The History of a Virginia Slave Community is a magisterial work that breaks new ground in historical methodology and offers scholars an alternative model for reconstructing the collective experience of slave communities.
The producer of MTV's gay-inclusive hit series breaks new ground as one of a newborn's two fathers
Because Kay emphasizes the importance of rivalries in Jonson's career, his book is especially valuable for its discussion of literary sources; here he often breaks new ground, and indeed some of his insights would be worth exploring more fully in later studies.
The author as well breaks new ground in showing how several Masonic leaders established journals to respond to their opponents' attacks.