mil·​li·​bar | \ ˈmi-lə-ˌbär How to pronounce millibar (audio) \

Definition of millibar

: a unit of atmospheric pressure equal to ¹/₁₀₀₀ bar or 100 pascals

Examples of millibar in a Sentence

Recent Examples on the Web The definition of a bomb cyclone is a storm that drops 24 millibars in 24 hours, going through a process known as bombogenesis. NBC News, "Mother's Day weekend snowstorm could bring bomb cyclone, thundersnow to Northeast," 7 May 2020 The all-time lowest pressure on record for a North Atlantic storm hit 913 millibars in January 1993 near Scotland's Shetland Islands, according to Weather Underground weather historian Christopher Burt. Doug Stanglin, USA TODAY, "Winter storm barreling toward the UK is possibly the strongest ever for North Atlantic," 15 Feb. 2020 In fact, this storm will qualify as a 'bomb cyclone,' dropping more than 24 millibars in 24 hours. NBC News, "Close call for the Northeast as bomb cyclone clips Cape Cod as it heads out to sea," 6 Mar. 2020 The National Weather Service Ocean Prediction Center said Storm Dennis deepened by 40 millibars in 24 hours, becoming one of the five strongest non-tropical cyclones on record in the North Atlantic. Fox News, "Storm Dennis spawns major flooding in UK as 'danger to life' warnings issued," 18 Feb. 2020 Most forecasts have had the pressure of this storm bottoming out at 918-921mb (millibars). Allison Chinchar, CNN, "More intense windstorms are expected to lash the UK and Europe this weekend," 15 Feb. 2020 Bombogenesis occurs when a storm's central barometric pressure plummets 24 millibars in 24 hours. Matthew Cappucci,, "Bombogenesis, thundersnow and the polar vortex: Explaining what your favorite winter weather terms mean," 21 Nov. 2019 To earn the title, its pressure generally must drop 24 millibars (a unit that measures pressure) within 24 hours. Jennifer Gray, CNN, "A bomb cyclone is knocking out power and disrupting travel in the Northeast," 17 Oct. 2019 Frederic’s lowest pressure was 943 millibars, or 27.85 inches. Leigh Morgan, al, "Remembering Hurricane Frederic, 40 years ago today," 12 Sep. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'millibar.' 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 millibar

1910, in the meaning defined above

History and Etymology for millibar

International Scientific Vocabulary

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Time Traveler for millibar

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The first known use of millibar was in 1910

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Statistics for millibar

Cite this Entry

“Millibar.” Dictionary, Merriam-Webster, Accessed 23 Sep. 2020.

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More Definitions for millibar


mil·​li·​bar | \ ˈmil-ə-ˌbär How to pronounce millibar (audio) \

Medical Definition of millibar

: a unit of atmospheric pressure equal to ¹/₁₀₀₀ bar or 1000 dynes per square centimeter abbreviation mbar

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