hygrometer
hyg·ro·me·ter
noun
1.
measuring instrument for measuring the relative humidity of the atmosphere
Origin
From French hygromètre, from hygro- + -meter.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.