potometer

potometer

[puh-tom-i-ter]
noun Meteorology.
an instrument for measuring the amount of water that a plant loses through transpiration, consisting of a sealed vessel of water with a cutting inserted in such a way that moisture can escape only through absorption and transpiration.

Origin:
1880–85; < Greek potó(n) drink + -meter

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World English Dictionary
potometer (pəˌtɒmɪtə)
 
n
an apparatus that measures the rate of water uptake by a plant or plant part
 
[from Latin pōtāre to drink + -meter]

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