point source

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point source

A celestial object whose angular extent is too small to be measured.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

point source

[′pȯint ‚sȯrs]
(civil engineering)
A municipal or industrial wastewater discharge through a discrete pipe or channel.
(physics)
A source of radiation having definite position but no extension in space; this is an ideal which is a good approximation for distances from the source sufficiently large compared to the dimensions of the source.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

point source

A light source whose dimensions are insignificant compared with the distance at which it is used; e.g., a fluorescent lamp is a point source when viewed from a large distance but a line source when viewed close to the source.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.