planimeter

noun
pla·​nim·​e·​ter | \plā-ˈni-mə-tər, plə-\

Definition of planimeter 

: an instrument for measuring the area of a plane figure by tracing its boundary line

First Known Use of planimeter

circa 1858, in the meaning defined above

History and Etymology for planimeter

French planimètre, from Latin planum plane + French -mètre -meter

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The first known use of planimeter was circa 1858

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planimeter

noun
pla·​nim·​e·​ter | \plā-ˈnim-ət-ər, plə- \

Medical Definition of planimeter 

: an instrument for measuring the area of a plane figure by tracing its boundary line

More from Merriam-Webster on planimeter

Britannica.com: Encyclopedia article about planimeter

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