Line-of-sight


noun
1.
Also called line of sighting. an imaginary straight line running through the aligned sights of a firearm, surveying equipment, etc.
2.
Astronomy. an imaginary line from an observer to a celestial body, coincident with the path traveled by light rays receivedfrom the body.
3.
Radio. a straight line connecting two points sufficiently high and near one another so that the line is entirely above the surface of the earth.
4.
Ophthalmology. .
5.
.
noun
1.
the straight line along which an observer looks or a beam of radiation travels
2.
(ophthalmol) another term for line of vision

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