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[at-mom-i-ter] /ætˈmɒm ɪ tər/
an instrument for measuring the rate at which water evaporates.
Also called evaporimeter.
Origin of atmometer
First recorded in 1805-15; atmo- + -meter Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for atmometer


an instrument for measuring the rate of evaporation of water into the atmosphere Also called evaporimeter, evaporometer
Derived Forms
atmometry, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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atmometer in Science
An instrument that measures the rate of evaporation of water into the atmosphere. Atmometers usually measure the evaporation of water from a free water surface (such as a pan of water set into the ground so that the water's surface is even with the ground's surface) or from a porous, water-saturated surface (such as filter paper placed over a graduated cylinder of water). In the first type, the difference between the ground surface and the water level is used to calculate the volume of water that has evaporated in a given period of time. In the second type, the water volume is read directly from the graduated cylinder. Also called evaporimeter.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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