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point source

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noun Physics, Optics.
  1. a source of radiation sufficiently distant compared to its length and width that it can be considered as a point.
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Origin of point source

First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for point source

point source

noun
  1. optics a source of light or other radiation that can be considered to have negligible dimensions
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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

point source in Medicine

point source

n.
  1. A source, especially of pollution or radiation, occupying a very small area and having a concentrated output.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.