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polar front
noun
: the boundary between the cold air of a polar region and the warmer air of lower latitudes
Examples of polar front in a Sentence
Recent Examples on the Web
This sudden mid-air jolt is caused by wind shear created by the jet stream, specifically the polar front jet stream in northern latitudes.
—Darren Orf, Popular Mechanics, 5 Sep. 2023
The difference in temperatures across the planet—hot at the equator and cold at the poles—causes enormous low-pressure systems and polar fronts, resulting in seasonal windstorms.
—Joe Pappalardo, Popular Mechanics, 8 May 2023
Then a big change will be felt in the temperature department across the state as the combination of Nicole’s circulation and a polar front bring down much cooler air into the state starting on Friday and lasting into the weekend.
—Leigh Morgan, al, 9 Nov. 2022
And those anomalous years offer a preview of how the Southern Ocean is expected to warm in the coming decades, steadily shifting the polar front farther south.
—Eli Kintisch, Science | AAAS, 19 Mar. 2020
The polar front doesn’t stay in the same place every year.
—Eli Kintisch, Science | AAAS, 19 Mar. 2020
Adult penguins take turns to forage for food, traveling hundreds of miles to reach the Antarctic polar front—a nutrient-rich stretch of ocean where cold deep water meets warmer patches.
—Julissa Treviño, Smithsonian, 1 Mar. 2018
In addition to a reliable source of food like the Antarctic polar front, king penguins also need tolerable temperatures, islands with smooth beaches (not rocky ones) and relatively little ice, Hignett writes.
—Julissa Treviño, Smithsonian, 1 Mar. 2018
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Word History
First Known Use
1920, in the meaning defined above
Dictionary Entries Near polar front
Cite this Entry
“Polar front.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/polar%20front. Accessed 1 Dec. 2024.
More from Merriam-Webster on polar front
Britannica.com: Encyclopedia article about polar front
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