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 ?
In this type of benchrest competition, shooters fire at targets that have six bulls, five of which are record targets and one that is a sighter target.
It's still essential that full-backs Glen Johnson and Nadir Belhadj do their jobs properly, and if they do it well Darren Bent may get fewer sighters on David James's goal than Jo, Robinho, Salomon Kalou and Didier Drogba have enjoyed recently.
I can't believe that hotshot Ruud van Nistelrooy won't get one or two sighters of Igor Akinfeev's net.
This year's MVP produced precious little in Game One but the fact that he got so many sighters of the basket has to be a concern for Doc Rivers.
Like the rest of the team before Grand National night, he was given a number of sighters of Plough Lane, and is now fully settled in at the track.
Dunn, who has made only four appearances this term, is given a free rein behind Emile Heskey and that should see him earn a few sighters at the Man City goal at Eastlands.
He has three goals in nine so far, another one from the spot that earned AZ their qualifying round win against Krylya Sovetov, and he gets plenty of sighters of goal in a positive formation under the adventurous Louis van Gaal.
Manley's One Dart nom de plume is based more on reputation than fact, and it's hard to imagine him getting too many sighters of the outer ring anyway.