Definition of point source
1
: a source of radiation (such as light) that is concentrated at a point and considered as having no spatial extension
2
: an identifiable confined source (such as a smokestack or wastewater treatment plant) from which a pollutant is discharged or emitted
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Merriam-Webster unabridged
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Time Traveler for point source
The first known use of point source was in 1894
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