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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 ?
The Ground Floor provides services to roughly 20-35 visitors a week and is expected to serve roughly 400 annually.
? The Chronicle tested the flammability of insulation cladding removed from the ground floor of three tower blocks in Newtown
* At 98 Smith Street in Brooklyn, a two-story property offering 600 s/f of ground floor retail space, Eleven Jewelry has signed a lease.
Ground floor lobby and reception: monolithic reception desk with writing tablets of stacked glass.
The ground floor space is situated on the north side of West 49th Street between Eighth and Ninth Avenues.
TYPE: Two-bedroom ground floor apartment RENTAL: pounds 750 pcm - furnished AGENT: Archer Bassett TELEPHONE: 024 7659 2255 It benefits from gas-fired central heating, double glazing, an alarm and secure entry phone system.
The ground floor is connected to a contiguous lower level of about 5,500 s/f, a space which has served as a private event venue for the art, music, and fashion industries and has a unique, private entrance off of Extra Place--the alleyway behind the space--as well as from within the ground floor space.
2395 Broadway at 88th Street, offers 1,450 s/f on the ground floor and is just steps from the 86th Street subway; 2519 Broadway at 94th Street is 2,300 s/f on the ground floor and; 2600 Broadway at 98th Street offers 1,350 s/f on the ground floor with 16-foot ceilings.
WITHIN 15 minutes of Birmingham International and the NEC, this modern ground floor office suite in Meriden is available to let on a new lease.