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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 ?
"Hopefully, there will be time when Washington has enough courage to officially acknowledge that not only there has been no collusion, but all the insinuations about the so-called Russian meddling are groundless slander invented for the sake of domestic political fight in the United States," the foreign ministry said in a statement, according to RIA Novosti.
As it stands, the visit to Prishtina is groundless," Mehmeti said.
"DXBMediaOffice asserts that recent rumors on social media platforms about engagement of Dubai Crown Prince @HamdanMohammed is groundless,"Ceread the tweet.
Our October 11 story read: "Redcar folks' fear of large-scale destruction proved groundless. There was trouble and over 50 arrests, but damage to property was minimal and the financial spin-off of the mass invasion was considerable."
Homeowners' form: The homeowners' form states that the insurer will "provide a defense at our expense by counsel of our choice, even if the suit is groundless, false or fraudulent ...
Therefore, the minister said, the accusations for inefficient use of funds are groundless.
We believe that such newsflow, much of which is groundless and merely a regurgitation of already known facts, will keep interest in the stock alive and support share performance in the anticipation of a tender offer.
China and the US should avoid "groundless accusations" against each other about cyber-security and hacking into each other's computer systems, newly installed Premier Li Keqiang said on Sunday.
Groundless Grounds: A Study of Wittgenstein and Heidegger.
I am confident all suspicions are groundless," MP Madylbekov said in the statement e-mailed to media on Tuesday.
Replying to AA's questions on Tuesday, Turkish Foreign Ministry spokesman Selcuk Unal said that British The Times newspaper claimed that Turkey turned a blind eye to Syrian regime's using Turkey as a route to obtain weapons, and those claims were groundless. Turkey's Syria policy is clearly known, said Unal, adding that those claims were groundless.