Source : Webster's Revised Unabridged Dictionary (1913)

Volumetrical \Vol`u*met"ric*al\, a.
   Volumetric. -- {Vol`u*met"ric*al*ly}, adv.

Source : WordNet®

volumetrical
     adj : of or relating to measurement by volume; "volumetric
           analysis" [syn: {volumetric}]