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hair hygrometer

noun
1.
a hygrometer actuated by the changes in length of a strand of human hair brought about by changes in the relative humidity.
Origin
1875-1880
1875-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for hair hygrometer
  • Also, a hair hygrometer needs frequent adjustment and calibration.
  • Since hair becomes longer on humid days and shorter on dry days, these changes in length are recorded using the hair hygrometer.

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