point source


: a source of radiation (such as light) that is concentrated at a point and considered as having no spatial extension
: an identifiable confined source (such as a smokestack or wastewater treatment plant) from which a pollutant is discharged or emitted

Examples of point source in a Sentence

Recent Examples on the Web Methane spewing from major US landfills is on average 40% greater than reported, according to a new study published in Science in which scientists used aerial surveys to identify point source emissions from hundreds of waste sites. Aaron Clark, Fortune, 30 Mar. 2024 The effort was the most comprehensive study to-date of point sources of methane emissions from the waste sector, the authors write. Will Sullivan, Smithsonian Magazine, 3 Apr. 2024 Many of the farms and point sources are downstream of the lake, Robertson said, so efforts need to go even further to reduce phosphorus levels. Caitlin Looby, Journal Sentinel, 31 Jan. 2024 While the Clean Water Act sets limits for pollutants from point sources, phosphorus and nitrogen are not included in those regulations, and the laws do not even include nonpoint sources, which account for more than 80% of phosphorus in Wisconsin waters. Caitlin Looby, Journal Sentinel, 31 Jan. 2024 The new collaboration aims to track both specific point sources of methane emissions and broader dispersed sources, as well as emission rates and how emissions of the gas are changing over time. Will Sullivan, Smithsonian Magazine, 20 Feb. 2024 Talks with Atlanta over Dejounte Murray, which at one point sources believed to be at least kind of close, stalled over the Lakers’ refusal to include Austin Reaves. Dan Woike, Los Angeles Times, 8 Feb. 2024 But even that precision is not quite enough to isolate point sources. Anna Kuchment, Scientific American, 1 Sep. 2021 Well, there is the artificial light that comes from say a skyscraper, considered to be a point source of such light, and there is the skyglow type of light, proffering a combined effect that muddles together the thousands upon thousands of point source lights. Lance Eliot, Forbes, 2 Jan. 2022

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'point source.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1894, in the meaning defined at sense 1

Time Traveler
The first known use of point source was in 1894

Dictionary Entries Near point source

Cite this Entry

“Point source.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/point%20source. Accessed 23 May. 2024.

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