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Related to point source: Nonpoint source
point sourceA celestial object whose angular extent is too small to be measured.
point source[′pȯint ‚sȯrs]
A municipal or industrial wastewater discharge through a discrete pipe or channel.
A source of radiation having definite position but no extension in space; this is an ideal which is a good approximation for distances from the source sufficiently large compared to the dimensions of the source.
A light source whose dimensions are insignificant compared with the distance at which it is used; e.g., a fluorescent lamp is a point source when viewed from a large distance but a line source when viewed close to the source.