sight

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sight:

see visionvision,
physiological sense of sight by which the form, color, size, movements, and distance of objects are perceived. Vision in Humans

The human eye functions somewhat like a camera; that is, it receives and focuses light upon a photosensitive receiver, the retina.
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sight

[sīt]
(navigation)
(ordnance)
Mechanical or optical device for aiming a firearm or for laying a gun or launcher in position.
To aim at a target or aiming point.
(physiology)

sight

i. An optical device for the measurement of drift. See drift indicator.
ii. An aiming device for aiming weapons. It may be a part of a head-up display or a separate unit. It may be fixed, gyro, or electronic. See sight glass (iii).
iii. To make an observation of a heavenly body with a sextant.

sight

1. the power or faculty of seeing; perception by the eyes; vision
2. any of various devices or instruments used to assist the eye in making alignments or directional observations, esp such a device used in aiming a gun
3. an observation or alignment made with such a device
References in periodicals archive ?
Astronomers around the world are getting their telescopes ready to catch sight of a speeding ball of rock which will fly past the Earth on Tuesday night.
Walking ahead, we catch sight of High Park Farm and the roadway swings to the right close to the farm buildings.
Driving is a better way to catch sight of big game; a bush walk offers quieter pleasures.
For Giulio Paolini, art is forever trying to catch sight of its own gaze--and forever escaping.
Apparently, it can go up to 50mph so we have been encouraging as many local shoppers as possible to 'stop me and try one' when they catch sight of it.
She is the prism through which I can catch sight of my own better self.
Mr Elson, 45, from Somerset, said: "I'm sure the captain had a hard time keeping his plane upright, when all the passengers rushed to one side to catch sight of us.
But how often do you catch sight of it, free and exposed?
One can still catch sight of Catholics who say the rosary, attend Mass daily, make pilgrimages, tip their hat while passing a church, sing the Angelus, "offer it up," celebrate saints' days, memorize prayers, and express their faith in countless other ways that reveal their Catholicity.
It's job-hunting season, as this year's graduates catch sight of the end of their college tribulation.
The journey by Margalla Tourist Train Service would enable the tourists to catch sight of Shakarparian Hills along with National Monument, Lok Virsa and Pakistan Natural History Museum.