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 ?
The South Pole has become a popular tourism destination recently with more than 40,000 sight-seers, including 7,000 from Britain, arriving in the area every year.
Their journey to Bangor generated so much interest Euston station was packed with sight-seers for what the Daily Mirror called a "Mystical Special" - otherwise known as the 3:15 stopping train to Bangor.
More than a quarter more UKbased sight-seers came to Merseyside in 2008 than 2007.
Now many of the residents are asking for the house to be demolished in a bid to stop the sick influx of ghoulish sight-seers.
The land closure was a result of increasing numbers of sight-seers who wanted to get a look at the large herds of deer gathered in the feeding areas, said Russ Japuntich, a BLM wildlife biologist.
Cost to ride will be $25 for skiers and boarders, $14 for sight-seers.
It was thought the shark had moved on but sight-seers on the Seaprobe Atlantis boat, based in Kyle of Lochalsh, opposite the Skye coast, were stunned when they saw the shark swim beneath them last week.
The area is visited by thousands of tourists and local sight-seers every year.
The Appalachian Mountain range dips down into the northern part of the state to provide some of the most beautiful vistas anywhere, and the many two-lane highways that transverse the area are popular with motorists, sight-seers, and outdoorsmen.
And for those who hate the hustle and bustle of the tourist trail, complete with coach loads of sight-seers with no concept of queuing, there couldn't be a better time to visit one of the ancient wonders of the world and enjoy it in all its splendour and relative peace among just a few hundred travellers.
Those on the Boston Common, known to sight-seers the country over, are as cosmopolitan by nature as our city children.