The definition of baro means pressure or weight.
(prefix)An example of the baro prefix is in the word barometer, which is a device that measures atmospheric pressure.
See baro- in Webster's New World College Dictionary
Origin: < Gr baros, weight < barys, heavy: see grave
See baro- in American Heritage Dictionary 4
or bar-
prefixOrigin:
Origin: From Greek baros, weight; see gwerə-1 in Indo-European roots
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