potometer

noun
po·tom·e·ter | \ pō-ˈtä-mə-tər \

Definition of potometer 

: an apparatus for measuring the rate of transpiration in a plant by determining the amount of water absorbed

First Known Use of potometer

1884, in the meaning defined above

History and Etymology for potometer

Greek poton drink (akin to Greek pinein to drink) + English -meter — more at potable

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potoroo

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Time Traveler for potometer

The first known use of potometer was in 1884

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