[ at-mom-i-ter ]
/ ætˈmɒm ɪ tər /


an instrument for measuring the rate at which water evaporates.

Nearby words

  1. atm.,
  2. atma,
  3. atman,
  4. atmo-,
  5. atmolysis,
  6. atmometry,
  7. atmophile,
  8. atmos clock,
  9. atmosphere,
  10. atmospheric

Origin of atmometer

First recorded in 1805–15; atmo- + -meter

Also called evaporimeter. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for atmometer

British Dictionary definitions for atmometer


/ (ætˈmɒmɪtə) /


an instrument for measuring the rate of evaporation of water into the atmosphereAlso called: evaporimeter, evaporometer
Derived Formsatmometry, 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

Science definitions for atmometer


[ ăt-mŏmĭ-tər ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.