Definition of point source
1 : a source of radiation (as light) that is concentrated at a point and considered as having no spatial extension
2 : an identifiable confined source (as a smokestack or wastewater treatment plant) from which a pollutant is discharged or emitted
First Known Use of point source
Seen and Heard
What made you want to look up point source? Please tell us where you read or heard it (including the quote, if possible).