[hyoo-mid-uh-stat or, often, yoo-]
an instrument for measuring and controlling humidity.
Also called hygrostat.

1905–10; humid + -i- + -stat Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
humidistat (hjuːˈmɪdɪˌstæt)
Also called: hygrostat a device for maintaining constant humidity

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
humidistat   (hy-mĭd'ĭ-stāt')  Pronunciation Key 
See hygrostat.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Some humidifiers contain a built-in humidistat which may be adjusted to the
  proper moisture level.
Your humidistat is set too high if excessive moisture collects on windows and
  other cold surfaces.
Some models have the fan speed controlled by a humidistat.
The specification also requires inclusion of an adjustable humidistat.
Related Words
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