• (n.) A tracing, usually made by the barograph, showing graphically the variations of atmospheric pressure for a given time.
The graphic record of pressure produced by a barograph.
Bar'o·gram noun [ Greek ... weight + -gram .] (Meteor.) A tracing, usually made by the barograph, showing graphically the variations of atmospheric pressure for a given time. 
barogram A graphic representation of changes in atmospheric pressure, as measured by a barograph (an instrument that continuously and automatically records changes in pressure on a rotating drum).