millibar
/ˈmɪlɪbɑr/
noun
- A unit of atmospheric pressure equal to one thousandth of a bar, used especially in weather reports.
- A typical sea-level atmospheric pressure is about 1013 millibars.
- The barometer reading fell by 20 millibars overnight, indicating a low-pressure system.
- The weather forecast said the pressure would drop to 990 millibars as the storm approached.