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Definition of Rain gauge
1. Noun. Gauge consisting of an instrument to measure the quantity of precipitation. 
Definition of Rain gauge
1. Noun. A device, used in meteorology, to measure rainfall; a pluviometer. ¹
¹ Source: wiktionary.com
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1. Noun. Gauge consisting of an instrument to measure the quantity of precipitation. 
1. Noun. A device, used in meteorology, to measure rainfall; a pluviometer. ¹
¹ Source: wiktionary.com