atmometer

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at·mom·e·ter

(at-mom'ĕ-ter),
An instrument for measuring the rate of evaporation.
[atmo- + G. metron, measure]
Farlex Partner Medical Dictionary © Farlex 2012

atmometer

an instrument for measuring the rate of evaporation of water into the air, used in experiments on TRANSPIRATION. This is simply carried out by measuring the level of water in a calibrated cylinder at frequent intervals.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005