point source

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point source

(poynt sōrs),
In photometry, a small source of light that is regarded as a geometric point from which light emanates in straight lines in all directions.
Farlex Partner Medical Dictionary © Farlex 2012

point source

A geographically limited, fixed location from which a disease or an environmental pollutant spreads.
Medical Dictionary, © 2009 Farlex and Partners

source, point 

A source whose dimensions are sufficiently small to cause a radiation with a high degree of coherence. If the point source is situated on the axis of an optical system it gives rise to an axial ray and it is referred to as an axial point source. See coherent sources; axial ray.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann