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point source

noun, Physics, Optics.
a source of radiation sufficiently distant compared to its length and width that it can be considered as a point.
1900-05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for point source
  • As you approach a point source of light, the number of photons reaching your eye from that given point increases as well.
British Dictionary definitions for point source

point source

(optics) a source of light or other radiation that can be considered to have negligible dimensions
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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point source in Medicine

point source n.
A source, especially of pollution or radiation, occupying a very small area and having a concentrated output.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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