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  1  definition  found 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
  Hydrometric  \Hy`dro*met"ric\,  Hydrometrical  \Hy`dro*met"ric*al\, 
  a.  [Cf.  F.  hydrom[`e]trique.] 
  1.  Of  or  pertaining  to  an  hydrometer,  or  to  the  determination 
  of  the  specific  gravity  of  fluids. 
  2.  Of  or  pertaining  to  measurement  of  the  velocity, 
  discharge,  etc.,  of  running  water. 
  3.  Made  by  means  of  an  hydrometer;  as  hydrometric 
  {Hydrometric  pendulum},  a  species  of  hydrometer  consisting  of 
  a  hollow  ball  of  ivory  or  metal  suspended  by  a  treated 
  from  the  center  of  a  graduated  quadrant,  and  held  in  a 
  stream  to  measure  the  velocity  of  the  water  by  the 
  inclination  given  to  the  thread;  a  kind  of  current  gauge.