Definition of "hygrometer" [hy•grom•e•ter]

• Any of several instruments that measure atmospheric humidity. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The sharp demarcation of the western frontier by the grasshopper and the hygrometer is another, which will continue to operate until, by irrigation, tree-planting or some other device, a new climate can be manufactured for the Plains."
• "Portnoy advises using a humidity meter, also known as a hygrometer, to keep track of the humidity levels."
• "The instrument she mentioned was the hygrometer, which measures humidity Another view, 16 May, page 19, G2."