Source : Webster's Revised Unabridged Dictionary (1913)

Pluviometer \Plu`vi*om"e*ter\, n. [L. pluvia rain + -meter: cf.
   F. pluviom[`e]tre.]
   An instrument for ascertaining the amount of rainfall at any
   place in a given time; a rain gauge.

Source : WordNet®

pluviometer
     n : gauge consisting of an instrument to measure the quantity of
         precipitation [syn: {rain gauge}, {rain gage}, {udometer}]