isobar

noun
iso·​bar | \ ˈī-sə-ˌbär How to pronounce isobar (audio) \

Definition of isobar

1 : an imaginary line or a line on a map or chart connecting or marking places of equal barometric pressure
2 : one of two or more atoms or elements having the same atomic weights or mass numbers but different atomic numbers

Illustration of isobar

Illustration of isobar

isobar 1

Examples of isobar in a Sentence

Recent Examples on the Web Trying to predict the unpredictable is why meteorologists often wind up at the isobar after work. Star Tribune, 15 July 2021 But the local pressure gradient was most intense along the New England coast, where isobars were extremely crowded together, driving 40 to 50 mph sustained winds. Jeff Halverson, Washington Post, 5 Mar. 2018 The next image shows the incredible pressure gradient (change in pressure over distance, revealed by contour lines called isobars). Jeff Halverson, Washington Post, 5 Mar. 2018 From the two figures above, note that the isobars became spread apart and fewer in number (the signature of weakening) and the eyewall’s intense ring of rain diminished significantly. Jeff Halverson, Washington Post, 31 Aug. 2017 Dear Tom, What determines how isobars are drawn on weather maps? Tom Skilling, chicagotribune.com, 13 May 2017 Dear Tom, What determines how isobars are drawn on weather maps? Tom Skilling, chicagotribune.com, 13 May 2017 Isobars help the meteorologist locate frontal boundaries because fronts are located in troughs of low pressure. Tom Skilling, chicagotribune.com, 13 May 2017 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'isobar.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of isobar

circa 1864, in the meaning defined at sense 1

History and Etymology for isobar

International Scientific Vocabulary is- + -bar (from Greek baros weight); akin to Greek barys heavy — more at grieve

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Time Traveler for isobar

Time Traveler

The first known use of isobar was circa 1864

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Dictionary Entries Near isobar

isoamyl salicylate

isobar

isobarbaloin

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Statistics for isobar

Cite this Entry

“Isobar.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/isobar. Accessed 20 May. 2022.

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More Definitions for isobar

isobar

noun
iso·​bar | \ ˈī-sə-ˌbär How to pronounce isobar (audio) \

Kids Definition of isobar

: a line on a map to indicate areas having the same atmospheric pressure

isobar

noun
iso·​bar | \ ˈī-sə-ˌbär How to pronounce isobar (audio) \

Medical Definition of isobar

: one of two or more atoms or elements having the same atomic weights or mass numbers but different atomic numbers

More from Merriam-Webster on isobar

Britannica.com: Encyclopedia article about isobar

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