ground


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Related to ground: ground control, ground zero

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.

ground

Etymology: AS, grund
1 (in electricity) a connection between the electric circuit and the ground, which becomes a part of the circuit.
2 (in psychology) the background of a visual field that can enhance or inhibit the ability of a patient to focus on an object.

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.

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
References in classic literature ?
The estate had formerly belonged to a gentleman of opulence and taste, who had bestowed some considerable attention to the adornment of his grounds.
She stamped three times on the ground, and the earth trembled, and both the church and the monk began to shake.
This operation concluded, they hastily clambered over her sides, sliding down the guy ropes to the ground.
One may picture, too, the sudden shifting of the attention, the swiftly spreading coils and bellyings of that blackness advancing headlong, towering heavenward, turning the twi- light to a palpable darkness, a strange and horrible antagonist of vapour striding upon its victims, men and horses near it seen dimly, running, shrieking, falling headlong, shouts of dismay, the guns suddenly abandoned, men choking and writhing on the ground, and the swift broadening-out of the opaque cone of smoke.
How comes it that you are so lamentably less valiant now that you are on your own ground, face to face with the suitors in your own house?
He fell heavily to the ground, and the spear stuck in his heart, which still beat, and made the butt-end of the spear quiver till dread Mars put an end to his life.
Maintaining this position for a moment, the strange emotions depicted on his countenance soften down into one of humorous resignation to my will, and then looking wistfully up to the tufted top of the tree, he stands on tip-toe, straining his neck and elevating his arm, as though endeavouring to reach the fruit from the ground where he stands.
My recollections of the journey are now, for a little space, dim and confused, inasmuch as a singular drowsiness here overcame me, owing to the fact that we were passing over the enchanted ground, the air of which encourages a disposition to sleep.
In fact, we see the whole of it except that furthest part, which is covered by the Welsh Marches and those parts which are hidden from where we stand by the high ground of the immediate west.
Neither do I reckon it an ill seat, only where the air is unwholesome; but likewise where the air is unequal; as you shall see many fine seats set upon a knap of ground, environed with higher hills round about it; whereby the heat of the sun is pent in, and the wind gathereth as in troughs; so as you shall have, and that suddenly, as great diversity of heat and cold as if you dwelt in several places.
So quickly did my bow drop after the shot that I scarce had time to lash Woola to the deck and buckle my own harness to a gunwale ring before the craft was hanging stern up and making her last long drop to ground.
These immense creatures can go over a great deal of ground, and, from one day to another, are found at enormous distances from there they were last seen, like the whales, whose mass and speed they rival.