Source : Webster's Revised Unabridged Dictionary (1913)

Barometric \Bar`o*met"ric\, Barometrical \Bar`o*met"ric*al\, a.
   Pertaining to the barometer; made or indicated by a
   barometer; as, barometric changes; barometrical observations.

Source : WordNet®

barometrical
     adj : relating to atmospheric pressure or indicated by a
           barometer; "barometric pressure" [syn: {barometric}]