point source

/P OY1 N T S AO1 R S/
noun
  1. 1

    A source of pollution, radiation, waves, fluid or other substance that has one specific location (and negligible physical extent, distinguishing a point source from other source geometries). In simulations they can often be approximated using mathematical point sources.

  2. 2

    The abstract concept of a singularity emitting a flux or flow. A source with infinitesimal dimensions in space.

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Source: https://en.wiktionary.org/wiki/point%20source