Etymology
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millibar (n.)

unit of barometric pressure, by 1910, from milli- + bar (n.4).

updated on January 19, 2019

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Definitions of millibar from WordNet

millibar (n.)
a unit of atmospheric pressure equal to one thousandth of a bar;
atmospheric pressure at sea level is 1013 millibars
From wordnet.princeton.edu, not affiliated with etymonline.