The second month in the French Revolutionary calendar, roughly corresponding to October-November, named after mist or fog.
From French brume meaning 'mist' or 'fog,' plus -aire suffix. Created during the French Revolution's attempt to establish a new, rational calendar system (1793-1805).
The French Revolution tried to rationalize everything, including time—they renamed all 12 months after weather and nature (Brumaire, Frimaire, Nivôse), but it lasted only 12 years before France gave up and returned to the Gregorian calendar.
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