- a source of radiation sufficiently distant compared to its length and width that it can be considered as a point.
Origin of point source
First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- optics a source of light or other radiation that can be considered to have negligible dimensions
- 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.